Battery module and battery pack

Abstract

The utility model provides a kind of battery module and battery pack, it is related to battery technical field.Battery module includes shell, lower battery group, upper battery group and heat exchange plate.Through the pole of lower battery group and upper battery group and the opposite arrangement of spout valve, so that in the case where any battery group thermal runaway, the high-temperature gas and substance generated by battery group thermal runaway can be discharged rapidly through the spout valve of another battery group in opposite direction, reduce the direct influence to adjacent battery group, so as to effectively avoid harmful substances directly impacting to another layer battery group, thereby reduce the risk of battery module thermal runaway chain reaction, improve the safety performance of battery module;And, heat exchange plate can provide cooling or heating function for upper and lower two layers battery group simultaneously, ensure that the temperature distribution of first battery group and second battery group is more uniform and maintained within preset temperature range, so as to improve overall thermal management effect.

Description

Technical Field

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

[0002] In the design and application of battery modules, a key but challenging issue is the propagation of thermal runaway. Thermal runaway refers to the phenomenon of a rapid rise in battery temperature caused by internal short circuits, external impacts, overcharging, or other abnormal conditions.

[0003] Existing battery module designs are flawed. Once a battery pack experiences thermal runaway, the enormous heat released and the harmful gases produced will not only severely damage the battery pack itself, but will also easily affect adjacent battery packs through conduction and convection, causing them to also enter a state of thermal runaway. This chain reaction can rapidly spread throughout the entire battery module, potentially causing serious safety accidents such as explosions and fires, resulting in incalculable property damage and safety hazards. Utility Model Content

[0004] The purpose of this utility model is to provide a battery module and battery pack that improves space utilization efficiency and achieves efficient thermal management by optimizing the internal structural design.

[0005] The embodiments of this utility model are implemented as follows:

[0006] In a first aspect, this utility model provides a battery module, comprising:

[0007] case;

[0008] The lower battery pack is disposed on the housing and is provided with a first terminal post and a first ejection valve, both of which face the bottom wall of the housing.

[0009] An upper battery pack is disposed on the top side of the lower battery pack. The upper battery pack is provided with a second terminal post and a second ejection valve, both of which face the top wall of the housing.

[0010] A heat exchange plate is disposed between the lower battery pack and the upper battery pack.

[0011] In an optional embodiment, the lower battery pack includes a plurality of first cells, with the first terminal and the first ejection valve disposed on the first cells, and the upper battery pack includes a plurality of second cells, with the second terminal and the second ejection valve disposed on the second cells, the first terminal and the second terminal being disposed opposite to each other, and the first ejection valve and the second ejection valve being disposed opposite to each other.

[0012] In an optional embodiment, the heat exchange plate is provided with a liquid cooling channel for dissipating heat from the lower battery pack and the upper battery pack.

[0013] In an optional embodiment, the lower battery pack is welded to the bottom wall of the housing.

[0014] In an optional embodiment, the lower battery pack is bonded to the heat exchange plate.

[0015] In an optional embodiment, the upper battery pack is bonded to the heat exchange plate.

[0016] In an optional implementation, there are multiple lower battery packs and multiple upper battery packs, which are arranged in an array in a one-to-one correspondence.

[0017] Secondly, the present invention provides a battery pack, including a battery module as described in any of the foregoing embodiments.

[0018] The beneficial effects of the battery module and battery pack provided by this utility model embodiment include: by setting the first terminal and first ejector valve of the lower battery pack upwards, and setting the second terminal and second ejector valve of the upper battery pack downwards, that is, the terminals and ejector valves of the lower and upper battery packs are set opposite to each other, so that in the event of thermal runaway of any battery pack, the high-temperature gas and substances generated by the thermally runaway battery pack can be quickly discharged through the ejector valve facing the opposite direction to the other battery pack, reducing the direct impact on adjacent battery packs, thus effectively preventing harmful substances from directly impacting the other battery pack, thereby reducing the risk of chain reaction of thermal runaway of the battery module and improving the safety performance of the battery module; and by setting the heat exchange plate between the first and second battery packs, the heat exchange plate can provide cooling or heating functions for both the upper and lower battery packs at the same time, which not only enables the upper and lower battery packs to share the same heat exchange plate, but also ensures that the temperature distribution of the first and second battery packs is more uniform and maintained within the preset temperature range, thereby improving the overall thermal management effect. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the battery module structure provided in an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the battery module structure provided in an embodiment of the present utility model;

[0022] Figure 3 This is a cross-sectional view of the heat exchange plate provided in an embodiment of the present utility model.

[0023] Icons: 10-Battery module; 100-Housing casing; 200-Lower battery pack; 210-First cell; 211-First terminal; 212-First ejection valve; 300-Upper battery pack; 310-Second cell; 311-Second terminal; 312-Second ejection valve; 400-Heat exchange plate; 410-Liquid cooling channel. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In the design and application of battery modules, a key but challenging issue is the propagation of thermal runaway. Thermal runaway refers to the phenomenon of a rapid rise in battery temperature caused by internal short circuits, external impacts, overcharging, or other abnormal conditions.

[0031] Existing battery module designs are flawed. Once a battery pack experiences thermal runaway, the enormous heat released and the harmful gases produced will not only severely damage the battery pack itself, but will also easily affect adjacent battery packs through conduction and convection, causing them to also enter a state of thermal runaway. This chain reaction can rapidly spread throughout the entire battery module, potentially causing serious safety accidents such as explosions and fires, resulting in incalculable property damage and safety hazards.

[0032] Based on the problems existing in the current technology, please refer to Figures 1 to 3 This utility model provides a battery module 10, which is applied to battery packs and other related battery devices. It improves space utilization efficiency and achieves efficient thermal management by optimizing the internal structure design.

[0033] In detail, the battery module 10 includes a housing 100, a lower battery pack 200, an upper battery pack 300, and a heat exchange plate 400.

[0034] The lower battery pack 200 is disposed on the housing 100, and a first terminal post 211 is disposed on the side of the lower battery pack 200 facing the bottom wall of the housing 100; the upper battery pack 300 is disposed on the top side of the lower battery pack 200, and a second terminal post 311 is disposed on the upper battery pack 300, with the second terminal post 311 being disposed opposite to the first terminal post 211.

[0035] In other words, the lower battery pack 200 is inverted inside the housing 100, and the upper battery pack 300 is placed directly above the lower battery pack 200. In this case, by placing the heat exchange plate 400 between the lower battery pack 200 and the upper battery pack 300, the heat exchange plate 400 can provide cooling or heating functions for both battery packs simultaneously, ensuring that the temperature distribution of the lower battery pack 200 and the upper battery pack 300 is more uniform and maintained within the preset temperature range, thereby improving the overall thermal management effect.

[0036] Therefore, by placing the heat exchange plate 400 between the lower battery pack 200 and the upper battery pack 300, not only is the complexity of the cooling pipes reduced, which is beneficial for achieving lightweight design and cost optimization of the battery pack, but this design also reduces coolant flow resistance and flow rate differences, further enhancing system reliability. Furthermore, the intermediately positioned heat exchange plate 400 effectively utilizes the internal space of the battery module 10, avoiding the space congestion problem caused by traditional multi-sided arrangements, thus making the entire battery pack structure more compact and achieving the goal of lightweight product structure.

[0037] It is worth mentioning that the first terminal 211 and the second terminal 311 include the positive and negative terminals of the battery cell.

[0038] Specifically, the heat exchange plate 400 is provided with a liquid cooling channel 410, which is used to dissipate heat for the lower battery pack 200 and the upper battery pack 300.

[0039] In this embodiment, the lower battery pack 200 and the upper battery pack 300 share a liquid cooling channel 410, thereby reducing the complexity of the cooling pipes and providing cooling or heating functions for both the lower battery pack 200 and the upper battery pack 300 at the same time, thus improving the overall thermal management effect.

[0040] Specifically, the liquid cooling channel 410 extends in a U-shaped meandering pattern.

[0041] Furthermore, the lower battery pack 200 includes a plurality of first cells 210, and a first terminal 211 is disposed on the first cells 210. The upper battery pack 300 includes a plurality of second cells 310, and a second terminal 311 is disposed on the second cells 310. The first terminal 211 and the second terminal 311 are disposed opposite to each other.

[0042] In other words, the lower battery pack 200 is composed of multiple first cells 210 arranged in parallel. Each first cell 210 is provided with a first terminal 211, and the first terminal 211 is facing the bottom of the housing 100. Similarly, the upper battery pack 300 is composed of multiple second cells 310 arranged in parallel. Each second cell 310 is provided with a second terminal 311, and the second terminal 311 faces the top of the housing 100, so that the first terminal 211 and the second terminal 311 are arranged opposite to each other.

[0043] In this embodiment, the end of the battery cell with the terminal post is considered the top end, and the other end is considered the bottom end. Therefore, the lower battery pack 200 is arranged in an inverted position inside the housing 100, the upper battery pack 300 overlaps the lower battery pack 200, and the lower battery pack 200 is in an upright position.

[0044] Therefore, in this case, the bottom ends of the lower battery pack 200 and the upper battery pack 300 are arranged opposite each other, so the heat exchange plate 400 can be placed between the bottom ends of the lower battery pack 200 and the upper battery pack 300, and thermal management of the lower battery pack 200 and the upper battery pack 300 can be performed simultaneously through one heat exchange plate 400.

[0045] Furthermore, the lower battery pack 200 is also provided with a first ejection valve 212, which is located on the same side as the first terminal post 211.

[0046] In this embodiment, if the lower battery pack 200 malfunctions, the first ejection valve 212 ejects towards the bottom of the housing 100, that is, towards a direction away from the upper battery pack 300, in order to avoid affecting the upper battery pack 300 and thus avoid further thermal runaway.

[0047] The upper battery pack 300 is also equipped with a second ejection valve 312, which is located on the same side as the second terminal post 311.

[0048] Similarly, in the event of a malfunction in the upper battery pack 300, the second ejection valve 312 ejects towards the top of the housing 100, i.e., towards a direction away from the lower battery pack 200, in order to avoid affecting the lower battery pack 200 and thus prevent further thermal runaway.

[0049] It is worth mentioning that the first ejection valve 212 is located in the first battery cell 210, and the second ejection valve 312 is located in the second battery cell 310.

[0050] Optionally, the first ejection valve 212 and the second ejection valve 312 may be, but are not limited to, explosion-proof valves and pressure relief valves and other related structures.

[0051] Furthermore, the lower battery pack 200 is welded to the bottom wall of the housing 100. Therefore, a strong connection can be formed through welding, which significantly improves the mechanical strength between the lower battery pack 200 and the housing 100, thereby enhancing the impact and shock resistance of the entire battery module 10.

[0052] Furthermore, compared to bolts or other mechanical connections, welding reduces the use of additional components (such as screws, washers, etc.), helping to reduce overall weight and optimize the lightweight performance of the battery pack. Moreover, welded connections are less prone to loosening or aging, maintaining stable performance throughout the entire lifespan of the battery module 10 and reducing maintenance needs.

[0053] Of course, in other embodiments, the lower battery pack 200 and the housing 100 may be connected in other ways, which are not specifically limited here.

[0054] Furthermore, the lower battery pack 200 and the upper battery pack 300 are bonded to the heat exchange plate 400.

[0055] In this embodiment, bonding can provide a larger contact area between the lower battery pack 200, the upper battery pack 300 and the heat exchange plate 400, ensuring more uniform heat transfer between the heat exchange plate 400 and the battery pack, thereby improving the efficiency of the thermal management system.

[0056] It is understood that the lower battery pack 200 and the upper battery pack 300 can be bonded to the heat exchange plate 400 simultaneously, or they can be bonded by folding one side. Of course, in other embodiments, the lower battery pack 200 and the upper battery pack 300 can be connected to the heat exchange plate 400 in other ways, which are not specifically limited here.

[0057] Furthermore, there are multiple lower battery packs 200 and multiple upper battery packs 300, with each lower battery pack 200 and each upper battery pack 300 arranged in an array in a one-to-one correspondence.

[0058] In this embodiment, multiple lower battery packs 200 are disposed at the bottom of the housing 100 to form a lower battery pack 200, and multiple upper battery packs 300 are disposed above the corresponding lower battery packs 200 to form an upper battery pack 300, thereby effectively increasing the battery capacity of the battery module 10.

[0059] Furthermore, the present invention also provides a battery pack, which includes the battery module 10 as described in the above embodiments.

[0060] In summary, this utility model provides a battery module 10 and a battery pack. By inverting the lower battery pack 200 inside the housing 100 and placing the upper battery pack 300 directly above the lower battery pack 200, and placing the heat exchange plate 400 between the lower battery pack 200 and the upper battery pack 300, the heat exchange plate 400 can simultaneously provide cooling or heating functions for both battery packs. This ensures a more uniform temperature distribution between the lower battery pack 200 and the upper battery pack 300 and maintains it within a preset temperature range, thereby improving the overall thermal management effect. It not only reduces the complexity caused by reducing cooling pipes, which is conducive to achieving lightweight design and cost optimization of the battery pack, but also reduces coolant flow resistance and flow rate differences, further enhancing system reliability. Furthermore, the internal space of the battery module 10 is effectively utilized, avoiding the space congestion and even bulkiness problems caused by traditional multi-sided arrangements. This makes the entire battery pack structure more compact and achieves the goal of lightweight product structure. Moreover, by setting the first terminal post 211 and the first ejector valve 212 of the lower battery pack 200 upwards and the second terminal post 311 and the second ejector valve 312 of the upper battery pack 300 downwards, that is, the terminals and ejector valves of the lower battery pack 200 and the upper battery pack 300 are set opposite to each other, in the event of thermal runaway of any battery pack, the high-temperature gas and substances generated by the thermally runaway battery pack can be quickly discharged through the ejector valve facing the opposite direction to the other battery pack, reducing the direct impact on adjacent battery packs. This effectively avoids harmful substances directly impacting the other battery pack, thereby reducing the risk of thermal runaway chain reaction of the battery module 10 and improving the safety performance of the battery module 10.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery module, characterized in that, include: case; The lower battery pack is disposed on the housing and is provided with a first terminal post and a first ejection valve, both of which face the bottom wall of the housing. An upper battery pack is disposed on the top side of the lower battery pack. The upper battery pack is provided with a second terminal post and a second ejection valve, both of which face the top wall of the housing. A heat exchange plate is disposed between the lower battery pack and the upper battery pack.

2. The battery module according to claim 1, characterized in that, The lower battery pack includes multiple first cells, with the first terminal and the first ejection valve disposed on the first cell. The upper battery pack includes multiple second cells, with the second terminal and the second ejection valve disposed on the second cell. The first terminal and the second terminal are arranged opposite to each other, and the first ejection valve and the second ejection valve are arranged opposite to each other.

3. The battery module according to claim 1, characterized in that, The heat exchange plate is provided with a liquid cooling channel, which is used to dissipate heat for the lower battery pack and the upper battery pack.

4. The battery module according to claim 1, characterized in that, The lower battery pack is welded to the bottom wall of the casing.

5. The battery module according to claim 1, characterized in that, The lower battery pack is bonded to the heat exchange plate.

6. The battery module according to claim 1 or 5, characterized in that, The upper battery pack is bonded to the heat exchange plate.

7. The battery module according to claim 1, characterized in that, There are multiple lower battery packs and multiple upper battery packs, and the multiple lower battery packs and multiple upper battery packs are arranged in an array in a one-to-one correspondence.

8. A battery pack, characterized in that, Includes the battery module as described in any one of claims 1-7.

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