Battery explosion-proof structure and battery pack

Abstract

The utility model relates to a battery explosion-proof structure and a battery pack, the battery explosion-proof structure comprises a battery cell, a liquid cooling plate and an insulating sheet, and the battery cell is provided with an explosion-proof valve; the anti-explosion valve comprises at least one fragment; the liquid cooling plate is provided with a smoke outlet, and the fragments are folded towards the smoke outlet by taking the roots of the fragments as axes; the insulating sheet is provided with a through hole between the smoke outlet and the explosion-proof valve, and the broken sheet can pass through the through hole in a folded manner; when the fragments are folded in place, the fragments are not in contact with the side wall and the bottom surface of the smoke outlet; the battery explosion-proof structure and the battery pack are ingenious in design, the insulating sheet is adopted to replace a spraying process, the manufacturing process of a liquid cooling plate is simplified, the production cost is reduced, meanwhile, the potential quality problem caused by an improper spraying process is also reduced, and the physical isolation mode is more reliable than the spraying process depending on coating integrity; and meanwhile, the insulating sheets can prevent the fragments from being in contact with the bottom surface or the side wall of the smoke outlet in the liquid cooling plate, prevent electrical short circuit and protect the liquid cooling plate from being physically damaged when the fragments are turned over.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field more specifically, relate to a battery explosion -proof structure and battery package. BACKGROUND

[0002] A plurality of battery cells and a metal liquid cooling plate for heat dissipation of the plurality of battery cells are generally arranged in a new energy battery pack, an explosion-proof valve is arranged on the battery cell, and a smoke outlet corresponding to the explosion-proof valve is prearranged on the liquid cooling plate. When the battery cell is in thermal runaway, the fragments of the explosion-proof valve of the runaway battery cell are opened outward to realize pressure relief of the battery cell.

[0003] In order to solve the above problems, a high-temperature-resistant insulating coating is generally sprayed at the smoke outlet of the liquid cooling plate in the prior art to realize the purpose of insulating the fragments of the explosion-proof valve from the liquid cooling plate when the battery cell is in thermal runaway. However, spraying at the smoke outlet of the liquid cooling plate requires adjustment of spraying outside the flat spraying area, which has high quality control requirements, and the spraying process is relatively complicated. SUMMARY

[0004] The utility model solves the technical problems in the prior art and provides a battery explosion-proof structure and a battery pack.

[0005] On the one hand, the utility model adopts the technical scheme to solve the technical problems thereof, that is, a battery explosion-proof structure comprising a battery cell and a liquid cooling plate, wherein a pressure relief port of the battery cell is provided with an explosion-proof valve; the explosion-proof valve comprises at least one fragment covering the pressure relief port; the root of the fragment is fixedly connected to the battery cell; the liquid cooling plate is provided with a smoke outlet corresponding to the explosion-proof valve; the fragment can be folded towards the smoke outlet with its root as the axis; the battery explosion-proof structure further comprises an insulating sheet for isolating the fragment from the liquid cooling plate; the insulating sheet is provided with a through hole for the plurality of fragments to pass through between the smoke outlet and the explosion-proof valve; when the fragment is folded in place, the fragment does not contact the sidewall of the smoke outlet.

[0006] The battery explosion-proof structure comprises a liquid cooling plate provided with a pressure relief flue in communication with the smoke outlet;

[0007] The battery explosion-proof structure comprises a liquid cooling plate provided with a cooling channel for heat dissipation of the battery cell; and the cooling channel is arranged around the pressure relief flue;

[0008] The battery explosion-proof structure comprises a liquid cooling plate provided with a pressure relief flue in communication with the smoke outlet;

[0009] The battery explosion-proof structure, wherein the center line of the through hole coincides with the center line of the smoke outlet;

[0010] The battery explosion-proof structure, wherein when the fragment is folded in place, one end of the fragment connected with the battery cell abuts against the inner side wall of the through hole or extrudes the edge of the through hole to make it recessed in the direction of the smoke outlet;

[0011] The battery explosion-proof structure, wherein a plurality of fragments are arranged; the fragments extend from the edge of the pressure relief port to the middle part of the pressure relief port;

[0012] The battery explosion-proof structure, wherein the insulating sheet is made of a soft material capable of being deformed;

[0013] The battery explosion-proof structure, wherein the soft material has temperature resistance.

[0014] On the other hand, the utility model also provides a battery pack, wherein the battery pack is internally provided with the battery explosion-proof structure as any one of the above.

[0015] The battery explosion-proof structure and the battery pack are designed ingeniously, the insulating sheet is used to replace the spraying process, the manufacturing process of the liquid cooling plate is simplified, the production cost is reduced, potential quality problems caused by improper spraying process are reduced, the physical isolation mode is more reliable than the spraying process which depends on the integrity of the coating, the insulating sheet can not only prevent the fragment from contacting the bottom surface or the side wall of the smoke outlet of the liquid cooling plate to prevent electrical short circuit, but also protect the liquid cooling plate from physical damage when the fragment is folded, when the internal pressure of the battery cell abnormally increases, the fragment rapidly opens towards the smoke outlet of the liquid cooling plate by passing through the through hole of the insulating sheet, the response is rapid, so that the pressure is rapidly released, the explosion of the battery caused by excessive internal pressure is effectively prevented, the safety of the battery in use is greatly improved, and the application of the battery technology in various fields is promoted. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the present application will be further described in conjunction with the drawings and embodiments. The drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the premise of not paying creative labor:

[0017] Figure 1 is a perspective exploded view of a battery explosion-proof structure in the first embodiment of the present application.

[0018] Figure 2This is the internal structure of a battery explosion-proof structure in Embodiment 1 of this utility model. Figure One (Fragment 131 is not folded).

[0019] Figure 3 This is the internal structure of a battery explosion-proof structure in Embodiment 1 of this utility model. Figure Two (Fragment 131 is in a folded state). Detailed Implementation

[0020] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0023] Furthermore, the terms indicating orientation, such as "up, down, front, back, left, right, upper end, lower end, longitudinal," etc., are all based on the posture and position of the device or equipment described in this solution during normal use.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0025] Example 1:

[0026] A preferred embodiment of this utility model provides a battery explosion-proof structure, such as... Figures 1-2 As shown, the battery includes a battery cell 11 and a liquid cooling plate 12. An explosion-proof valve 13 is provided at the pressure relief port 111 of the battery cell 11. The explosion-proof valve 13 includes at least one fragment 131 covering the pressure relief port 111. The root of the fragment 131 is fixedly connected to the battery cell 11. The liquid cooling plate 12 has a smoke exhaust port 121 corresponding to the explosion-proof valve 13, allowing high-heat gases and potentially combustible substances in the battery cell to be directionally discharged. The fragment 131 can fold towards the smoke exhaust port 121 with its root as the axis, providing a rapid response; once the pressure exceeds a set value, the fragment can immediately activate. The battery explosion-proof structure also includes an insulating sheet 14 for isolating the fragment 131 from the liquid cooling plate 12. The insulating sheet 14 has through holes 141 between the smoke exhaust port 121 and the explosion-proof valve 13, through which multiple fragments 131 can fold and pass. Figure 3 As shown, when the fragment 131 is folded into place, the fragment 131 does not contact the side wall of the exhaust port 121, which can effectively prevent short circuits.

[0027] The battery's explosion-proof structure and battery pack design are ingenious. Using insulating sheets instead of spraying simplifies the manufacturing process of the liquid cooling plate, reduces production costs, and minimizes potential quality problems caused by improper spraying. This physical isolation method is more reliable than spraying, which relies on coating integrity. Simultaneously, the insulating sheets not only prevent fragments from contacting the bottom or sidewalls of the flue gas outlet on the liquid cooling plate, preventing electrical short circuits, but also protect the liquid cooling plate from physical damage when the fragments fold. When the internal pressure of the battery cell abnormally increases, the fragments quickly fold open through the through-holes in the insulating sheets towards the flue gas outlet on the liquid cooling plate, responding rapidly to release pressure quickly and effectively preventing the battery from exploding due to excessive internal pressure. These designs significantly improve battery safety and are of great significance for promoting the application of battery technology in various fields.

[0028] Furthermore, the liquid cooling plate 12 is provided with a pressure relief flue 122 connected to the exhaust port 121, which provides a larger channel for pressure release, so that when thermal runaway occurs in the battery cell, the high-pressure gas inside can be discharged more quickly and effectively, thereby reducing the internal pressure of the battery and reducing the risk of explosion; and the pressure relief flue can guide the flue gas to flow along a predetermined path without stagnation.

[0029] Furthermore, the liquid cooling plate 12 is provided with cooling channels (not shown in the figure) for heat dissipation of the battery cell 11; the cooling channels (not shown in the figure) are arranged around the pressure relief flue 122, which can more effectively manage the heat generated by the battery cell, ensure that the battery cell operates within the optimal temperature range, and improve battery performance and lifespan; while the pressure relief flue 122 discharges hot gas and combustion products, the cooling channels around it can help disperse and cool these high-temperature gases, prevent heat accumulation in specific areas, and enhance the overall safety of the battery system.

[0030] Furthermore, the area of ​​the through hole 141 is smaller than the area of ​​the exhaust port 121; alternatively, the center line of the through hole 141 coincides with the center line of the exhaust port 121, which can ensure that the fragment 131 will not come into contact with the side wall of the exhaust port 121 due to being too large when it is folded, thereby avoiding the risk of short circuit.

[0031] Furthermore, when the fragment 131 is folded into place, the end of the fragment 131 connected to the battery cell 11 abuts against or presses the edge of the through hole 141 against the inner wall of the through hole 141, causing it to be recessed towards the exhaust port 121.

[0032] In one embodiment, multiple fragments 131 can be provided; the fragments 131 extend from the edge of the pressure relief port 111 towards the center of the pressure relief port 111; multiple fragments can disperse the impact force during pressure relief, reduce the stress borne by a single fragment, reduce the risk of fragment damage, and multiple fragments can also quickly fold outwards for faster pressure relief; alternatively, a single fragment 131 can be provided, with its root fixedly connected to the battery cell, and the other end detached from the battery cell. When the battery cell becomes highly heated, the other end of the fragment 131 folds outwards under the influence of high voltage.

[0033] Alternatively, the insulating sheet 14 may be made of a deformable soft material, such as foam sheet; furthermore, the soft material may also have temperature resistance, such as silicone, which is both a soft material and has temperature resistance; for example, it may maintain stable physical properties in the range of 0°C to 600°C, and the insulating sheet will not melt when the battery cell is heated, which can effectively prevent the broken piece 131 from contacting the side wall of the exhaust port 121.

[0034] Example 2

[0035] This embodiment provides a battery pack, which is the same as that in Embodiment 1 and will not be repeated here. The difference is that the battery pack is provided with a battery explosion-proof structure as described in Embodiment 1.

[0036] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A battery explosion-proof structure comprising a battery cell and a liquid cooling plate, characterized by The battery explosion-proof structure comprises a liquid cooling plate and an electric core; the electric core is arranged on the liquid cooling plate; the electric core is provided with a pressure relief opening at an explosion-proof valve; the explosion-proof valve comprises at least one broken piece covering the pressure relief opening; the root of the broken piece is fixedly connected with the electric core; the liquid cooling plate is provided with a smoke exhaust opening corresponding to the explosion-proof valve; the broken piece can be folded towards the smoke exhaust opening with the root as the axis; the battery explosion-proof structure further comprises an insulating sheet for isolating the broken piece from the liquid cooling plate; the insulating sheet is provided with a through hole for the broken piece to pass through; when the broken piece is folded in place, the broken piece is not in contact with the side wall of the smoke exhaust opening.

2. The battery explosion-proof structure according to claim 1, wherein The liquid cooling plate is provided with a pressure relief flue in communication with the smoke exhaust opening.

3. The battery explosion-proof structure according to claim 2, characterized by The liquid cooling plate is provided with a cooling channel for heat dissipation of the electric core; the cooling channel is arranged around the pressure relief flue.

4. The battery explosion-proof structure according to any one of claims 1 to 3, wherein The area of the through hole is smaller than the area of the smoke exhaust opening.

5. The battery explosion-proof structure according to claim 4, wherein The center line of the through hole coincides with the center line of the smoke exhaust opening.

6. The battery explosion-proof structure according to claim 4, wherein When the broken piece is folded in place, the end of the broken piece connected with the electric core is in abutment with the inner side wall of the through hole or extrudes the edge of the through hole to make it recessed towards the smoke exhaust opening.

7. The battery explosion-proof structure according to claim 1, wherein The broken piece is provided with a plurality of broken pieces; the broken pieces extend from the edge of the pressure relief opening towards the middle part of the pressure relief opening.

8. The battery explosion-proof structure according to any one of claims 1 to 3 and 5 to 7, characterized by, The insulating sheet is made of a soft material capable of being deformed.

9. The battery explosion-proof structure according to claim 8, wherein The soft material has temperature resistance.

10. A battery pack, characterized by, The battery explosion-proof structure comprises a liquid cooling plate and an electric core; the electric core is arranged on the liquid cooling plate; the electric core is provided with a pressure relief opening at an explosion-proof valve; the explosion-proof valve comprises at least one broken piece covering the pressure relief opening; the root of the broken piece is fixedly connected with the electric core; the liquid cooling plate is provided with a smoke exhaust opening corresponding to the explosion-proof valve; the broken piece can be folded towards the smoke exhaust opening with the root as the axis; the battery explosion-proof structure further comprises an insulating sheet for isolating the broken piece from the liquid cooling plate; the insulating sheet is provided with a through hole for the broken piece to pass through; when the broken piece is folded in place, the broken piece is not in contact with the side wall of the smoke exhaust opening.

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