Battery module and battery pack

Abstract

The invention provides a battery module and a battery pack, the battery module comprises at least one battery cell group, the battery cell group is provided with a plurality of battery cell units arranged at intervals, and the top of each battery cell unit is provided with an explosion-proof valve; and the protection part is provided with a containing space, the battery cell group is arranged in the containing space, the top of the protection part is provided with a flow guide channel which is arranged in a penetrating mode in the height direction of the battery cell group, and the flow guide channel is used for conducting flow guide on the electrolyte sprayed out of the anti-explosion valve. By applying the technical scheme of the invention, the technical problem that the module is easy to generate thermal runaway can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery modules, and in particular to a battery module and a battery pack. Background Art

[0002] In the related art, traditional battery packs generally arrange cooling plates on the bottom of the battery cells, and use thermal insulation pads between adjacent battery cells to isolate heat transfer and prevent the spread of thermal runaway. However, the above battery pack design is prone to cause a chain reaction of heat release between modules. In the battery pack, if the insulation and heat dissipation design between modules is not effective enough, or there is not enough physical isolation between modules, when one module has thermal runaway, high-temperature gas, flame or electrolyte may be generated, which will affect the adjacent modules and may trigger thermal runaway of the adjacent modules. Therefore, the stable operation of the battery pack cannot be guaranteed. Summary of the invention

[0003] Embodiments of the present invention provide a battery module and a battery pack, which can improve the technical problem that the module is prone to thermal runaway.

[0004] In the first aspect, an embodiment of the present invention provides a battery module, which includes: at least one battery cell group, the battery cell group having a plurality of battery cell units arranged at intervals, and the top of the battery cell unit having an explosion-proof valve; at least one protective member, the protective member having a accommodating space, the battery cell group is arranged in the accommodating space, and the top of the protective member has a diversion channel that is arranged along the height direction of the battery cell group, and the diversion channel is used to divert the electrolyte sprayed out of the explosion-proof valve.

[0005] In one embodiment, the protective member further includes a blocking piece, which is movably connected to the protective member and can block or open the diversion channel.

[0006] In one embodiment, the blocking piece is rotatably disposed on the protective member, and the rotation axis of the blocking piece is perpendicular to the height direction of the battery cell group.

[0007] In one embodiment, the protective member further includes a reset member, one end of which is connected to the protective member, and the other end of which is connected to the baffle, and the reset member is used to apply a force to the baffle to block the guide channel.

[0008] In one embodiment, a liquid collecting groove is further provided on the top of the protective member. The liquid collecting groove is spaced apart from the flow guide channel and is recessed toward the battery cell group. The liquid collecting groove is used to contain the electrolyte sprayed out of the explosion-proof valve.

[0009] In one embodiment, a cross-sectional shape of the flow guiding channel along the length direction of the battery cell group is the same as a cross-sectional shape of the explosion-proof valve along the length direction of the battery cell group.

[0010] In one embodiment, the cross-sectional area of ​​the flow guide channel along the length direction of the battery cell group is S1, the cross-sectional area of ​​the explosion-proof valve along the length direction of the battery cell group is S2, and S1≥S2.

[0011] In one embodiment, the material of the protective element includes ceramic felt.

[0012] In one embodiment, the top of the protective element has a plurality of guide channels, and the plurality of guide channels are arranged in one-to-one correspondence with the plurality of explosion-proof valves.

[0013] In one embodiment, the protective member includes: a top plate; at least one side plate, wherein the side plate and the top plate enclose a receiving space, wherein a baffle, a reset member and a liquid collecting tank are arranged on the top plate, and a guide channel is arranged on the top plate along the height direction of the battery cell group.

[0014] In one embodiment, the height of the side plate is higher than the height of the top plate at a side away from the battery cell group.

[0015] In one embodiment, the return element comprises a spring.

[0016] In one embodiment, the battery module further includes: two end plates, which are respectively arranged at both ends of the battery cell group along the length direction of the battery cell group; a fixing member, which is wound around the battery cell group and the two end plates, and the fixing member is used to fix the battery cell group and the two end plates; and a heat conductive member, which is arranged between the end plate and the battery cell group.

[0017] In a second aspect, an embodiment of the present invention provides a battery pack, comprising: a box body; a liquid cooling plate, arranged at the bottom of the box body, the box body and the liquid cooling plate together enclose a receiving cavity; the above-mentioned battery module, the battery module is arranged in the receiving cavity, and the battery module is fixedly connected to the liquid cooling plate.

[0018] By applying the technical solution of the present invention, a protective member is provided, and a battery cell group is arranged in the accommodating space of the protective member, so that when the battery cell group has thermal runaway, the protective member can effectively block sparks or electrolytes from being ejected from the side of the protective member, and prevent the eruption of flames, gas and high-temperature particles after thermal runaway. In this way, the heat can be isolated inside the battery cell group to prevent the heat from being transferred to other adjacent battery cell groups, thereby reducing the risk of heat diffusion. At the same time, a diversion channel is provided on the top of the protective member. When the electrolyte is ejected through the pressure relief valve of the battery cell unit, the electrolyte is diverted through the diversion channel, so that the internal pressure of the battery cell group can be balanced to reduce safety risks such as fire and corrosion, thereby improving the safety performance of the battery module and the stability during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a three-dimensional schematic diagram of a battery module provided by an embodiment of the present invention;

[0021] Figure 2 is a three-dimensional schematic diagram of a protective element provided by an embodiment of the present invention;

[0022] Figure 3 is a schematic top view of a protective element provided by an embodiment of the present invention;

[0023] Figure 4 yes Figure 3 The enlarged schematic diagram of point A in the middle;

[0024] Figure 5 is a three-dimensional schematic diagram of a battery cell group provided by an embodiment of the present invention;

[0025] Figure 6 It is a three-dimensional schematic diagram of a battery pack provided by an embodiment of the present invention.

[0026] The above drawings include the following reference numerals:

[0027] 10. Battery cell group; 11. Battery cell unit;

[0028] 20. Protective element; 21. Accommodating space; 22. Guide channel; 23. Baffle; 24. Reset element; 25. Liquid collecting tank;

[0029] 30. Thermal insulation;

[0030] 40. End plate;

[0031] 50. Fixing parts;

[0032] 60. Heat conducting parts;

[0033] 70. Box;

[0034] 80. Liquid cooling plate;

[0035] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0037] like Figures 1 to 6 As shown, in the first aspect, an embodiment of the present invention provides a battery module, the battery module comprising: at least one battery cell group 10, each battery cell group 10 having a plurality of battery cell units 11 spaced apart along a second direction, and an angle being formed between the first direction and the second direction; at least one protective member 20, the protective member 20 having a receiving space 21, the battery cell group 10 being arranged in the receiving space 21, and the top of the protective member 20 having a guide channel 22 penetrating along a height direction of the battery cell group 10, the guide channel 22 being used to guide the electrolyte sprayed out of the explosion-proof valve.

[0038] By applying the technical solution of the present invention, a plurality of protective members 20 are provided, and the battery cell group 10 is arranged in the accommodating space 21 of the protective member 20, so that when the battery cell group 10 has thermal runaway, the protective member 20 can effectively block sparks or electrolytes from spraying out from the side of the protective member 20, and prevent the eruption of flames, gas and high-temperature particles after thermal runaway. In this way, the heat can be isolated inside the battery cell group 10 to prevent the heat from being transferred to other adjacent battery cell groups 10, thereby reducing the risk of heat diffusion. At the same time, a guide channel 22 is provided on the top of the protective member 20. When the electrolyte is ejected through the pressure relief valve of the battery cell unit 11, the electrolyte is guided through the guide channel 22, so that the internal pressure of the battery cell group 10 can be balanced to reduce safety risks such as fire and corrosion, thereby improving the safety performance of the battery module and the stability during operation.

[0039] In the present application, X is the first direction and Y is the second direction.

[0040] In one embodiment, the protective member 20 further includes a baffle 23, which is rotatably disposed in the flow guiding channel 22, and the rotation axis of the baffle 23 is perpendicular to the height direction of the battery cell group 10, and the baffle 23 can block or open the flow guiding channel 22. In this arrangement, the baffle 23 can block or open the flow guiding channel 22 to balance the internal pressure and prevent the flame from spreading through the flow guiding channel 22, which can further improve the safety of the device when in use.

[0041] In the present application, the material of the baffle 23 may be aerogel, mica sheet, etc., and the specific setting should be selected according to the actual use requirements.

[0042] Aerogel not only has the characteristics of heat insulation and high temperature resistance, but can also be functionally designed as needed, such as conductivity, insulation, etc., to meet the needs of different fields, so the applicability and scope of application of aerogel can be improved. Aerogel is a new type of nano-scale porous solid material, and its internal pore volume accounts for the vast majority of the entire material volume, and can even reach more than 99%. This high porosity makes aerogel have an extremely low density, and it is one of the lightest solid materials known at present, which can effectively reduce the overall weight of the protective member 20. At the same time, the thermal conductivity of aerogel is extremely low, and it is the solid material with the lowest thermal conductivity known at present. Its thermal insulation effect is 2 to 5 times that of traditional thermal insulation materials. This is mainly due to the nano-scale pore structure and low porosity of aerogel, which makes the air flow efficiency in it extremely low, thereby effectively reducing heat conduction. In addition, the high specific heat capacity of aerogel itself further reduces the transfer of thermal radiation, making its thermal insulation performance even better.

[0043] Furthermore, aerogel can remain stable in a high temperature environment and has high thermal stability. In this way, the stability of the baffle 23 during use can be ensured. The pore structure of aerogel is compact and evenly distributed, which can effectively prevent water penetration. This makes it have excellent performance in situations where waterproofing is required. In addition, the chemical properties of aerogel are stable and can maintain its performance unchanged in a variety of environments. This further broadens its scope of application, allowing it to play an excellent role in different fields. In addition, aerogel can maintain its stable performance over a wide temperature range. This makes its application in different fields more flexible and diverse.

[0044] Aerogels have a relatively long service life due to their stable chemical properties and strong structure. This reduces the cost of use and improves economic benefits. Aerogels not only have the above-mentioned excellent performance characteristics, but can also be functionally designed according to needs. Aerogels with different hardness, elasticity and other properties can be prepared by adjusting the preparation process. This makes aerogels have wide application potential in many fields. In recent years, with the improvement of environmental awareness and the popularization of the concept of sustainable development, the environmental protection and sustainability of aerogels have also received more and more attention. Researchers continue to reduce production costs and environmental pollution risks by improving preparation processes and developing new aerogel materials. For example, new aerogel materials such as biomass-based aerogels not only have excellent performance characteristics but also have good environmental protection and sustainability.

[0045] Furthermore, mica sheets perform well in fire prevention and have significant fire retardant properties. Since mica sheets can withstand high temperatures and are not easy to burn, they can maintain the stability and integrity of their structure even in high temperature environments. This feature makes mica sheets have a wide range of application value in the field of fire prevention. At the same time, mica sheets have good flame retardant properties and can effectively prevent the spread of fire. When encountering a fire source, mica sheets can slow down the burning speed and reduce the flame propagation speed, thereby playing a role in fire prevention and flame retardancy. And mica sheets also have good thermal insulation properties, which can effectively isolate heat transfer in a fire and reduce the impact of heat radiation from the fire on the surrounding environment. In the electronic and electrical industry, mica sheets are often used to make thermal insulation gaskets, insulating materials and other components for motors, electrical appliances and other equipment. These components can withstand high temperatures and prevent short circuits and other faults during the operation of the equipment, thereby improving the safety and reliability of the equipment.

[0046] In one embodiment, the protective member 20 further includes a reset member 24, one end of which is connected to a side of the top of the protective member 20 away from the battery cell group 10, and the other end of which is connected to a side of the baffle 23 away from the battery cell group 10, and the reset member 24 is used to apply a force to the baffle 23 to block the flow guide channel 22. By setting the above structure, it is possible to ensure that the baffle 23 blocks the flow guide channel 22 under normal circumstances to prevent foreign matter from entering the battery cell group 10, thereby ensuring the stability of the battery cell group 10 during operation.

[0047] In one embodiment, a liquid collecting tank 25 is further provided on the top of the protective member 20. The liquid collecting tank 25 is spaced apart from the flow guide channel 22, and the liquid collecting tank 25 is recessed toward the direction of the battery cell group 10. The liquid collecting tank 25 is used to contain the electrolyte sprayed out of the explosion-proof valve. This arrangement can prevent the electrolyte from flowing to other locations after the explosion-proof valve ruptures, thereby preventing the electrolyte from reacting with the electrical components of the battery cell group 10, thereby ensuring the safety of the battery cell group 10 when in use. At the same time, in the present application, the liquid collecting tank 25 is recessed toward the direction of the battery cell group 10, which can prevent the electrolyte from overflowing, causing environmental pollution or damage to the battery cell group 10.

[0048] In the present application, the protective member 20 is an integrated molding structure. The integrated molding process integrates multiple processes into one operation, greatly shortening the production cycle and improving production efficiency. At the same time, the automated integrated molding technology uses automated equipment and process control systems to achieve full automation of the entire process from raw material processing to finished product output, further improving production efficiency. In addition, the integrated molding process uses advanced mold design and manufacturing technology to ensure that the material can accurately fill every detail of the mold during the molding process, thereby improving the dimensional accuracy and shape accuracy of the product.

[0049] Furthermore, one-piece molding avoids secondary processing and gluing in traditional processes, reduces surface flaws and defects, and improves the overall quality of the product. In addition, proper heat treatment during the one-piece molding process also helps to improve the hardness and strength of the material, thereby improving the service life and reliability of the product.

[0050] In one embodiment, the cross-sectional shape of the flow guide channel 22 along the length direction of the battery cell group 10 is the same as the cross-sectional shape of the explosion-proof valve along the length direction of the battery cell group 10. This arrangement facilitates the electrolyte to flow out of the flow guide channel 22, and can also minimize the possibility of the electrolyte not entering the flow guide channel 22. In addition, the same cross-sectional shape means that standardized manufacturing processes and equipment can be used for production, which helps to reduce production costs and improve production efficiency, thereby facilitating mass production. Furthermore, the standardized cross-sectional shape helps to optimize the cutting and processing of materials and reduce material waste. At the same time, components with the same cross section are easier to achieve quality control and inspection during the manufacturing process.

[0051] In one embodiment, the cross-sectional area of ​​the flow guide channel 22 along the length direction of the battery cell group 10 is S1, and the cross-sectional area of ​​the explosion-proof valve along the length direction of the battery cell group 10 is S2, where S1 ≥ S2. By setting the above structure, the flow guide effect of the flow guide channel 22 can be improved as much as possible, thereby effectively reducing the risk of short circuit when the battery cell module is out of control.

[0052] In one embodiment, a heat insulating member 30 is provided between two adjacent battery cell units 11. In the present application, the heat insulating member 30 can be provided as a silicone heat insulating pad, because silicone has the following advantages:

[0053] 1. Good elasticity and cushioning performance: Since the silicone pad has excellent elasticity and cushioning performance, it can effectively absorb and disperse the impact force, thereby preventing collisions between adjacent battery cells 11 during use and causing damage to its own structure. Therefore, it can protect the structure of the battery cell 11 to further improve the service life of the battery cell 11.

[0054] 2. High and low temperature resistance: Since silicone can maintain the stability of its physical and chemical properties in a wide temperature range, it can maintain its good elasticity and durability regardless of high or low temperature environments. Therefore, it can prevent heat conduction between adjacent battery cells 11 as much as possible. This can effectively prevent the heat from the battery cell 90 from being transferred to other battery cells 11 when thermal runaway occurs, thereby ensuring the normal operation of the component.

[0055] 3. Excellent insulation performance: Since silica gel has excellent insulation performance, it can effectively prevent the current generated between the battery cells 11 from winding, and thus can also ensure the stability of the battery cells 11 in the present application when in use.

[0056] 4. Easy to process and shape: Since silicone can be processed and formed through molds to produce gaskets of various shapes and sizes to meet the use requirements in different environments, it can reduce the processing difficulty of the structure, thereby improving the production efficiency of the structure and reducing the implementation cost of the structure.

[0057] Optionally, in other embodiments of the present application, the thermal insulation member 30 may also be set to aerogel, etc., as long as it can meet the use requirements of the device. The specific setting should be selected according to the use environment of the device, which can improve the applicability and scope of application of the device.

[0058] In one embodiment, the material of the protective member 20 includes ceramic felt. Ceramic felt, as a high temperature wear-resistant material, has many significant advantages, which make it widely used in many fields. The following are the main advantages of ceramic felt:

[0059] 1. Excellent high temperature resistance: The temperature resistance of ceramic felt can reach over 1100°C, and some advanced materials can even reach 2000°C. This high temperature resistance allows it to remain stable in extremely high temperature environments without softening or melting. Under high temperature conditions, ceramic felt can maintain a high strength retention rate, such as the strength retention rate of silicon carbide fiber at high temperatures exceeding 80%. This can ensure the stability of the protective element 20 during use, thereby ensuring the protective effect of the protective element 20.

[0060] 2. Excellent thermal insulation performance: Ceramic felt has extremely low thermal conductivity, which can effectively block the transfer of heat, reduce heat exchange, and improve thermal efficiency. This makes ceramic felt an ideal thermal insulation material, thereby avoiding the phenomenon of thermal runaway conduction between adjacent battery cells 11.

[0061] 3. Good wear resistance: The ceramic felt has high durability and will not decompose or crack due to long-term friction, which can extend the service life of the protective member 20 and reduce the use cost of the protective member 20.

[0062] 4. Excellent acid and alkali resistance: Chemical stability: Ceramic fiber felt has excellent resistance to most acid and alkali substances and corrosive gases, and can be used for a long time in a complex chemical environment without being damaged.

[0063] In one embodiment, the battery module includes a plurality of battery cell groups 10 and a plurality of protective members 20, wherein the plurality of battery cell groups 10 are arranged at intervals along a first direction, and the protective members 20 are arranged one-to-one with the battery cell groups 10. The top of the protective member 20 has a plurality of flow guide channels 22, and the plurality of flow guide channels 22 are arranged one-to-one with the plurality of explosion-proof valves. This can further improve the flow guide effect.

[0064] In one embodiment, the protective member 20 includes: a top plate; at least one side plate, the side plate and the top plate are enclosed to form a receiving space 21, wherein the baffle 23, the reset member 24 and the liquid collecting tank 25 are arranged on the top plate, and the guide channel 22 is arranged on the top plate along the height direction of the battery cell group 10. Such a configuration can facilitate the guide channel 22 to guide the electrolyte.

[0065] In one embodiment, the height of the side plate is higher than the height of the top plate away from the battery pack 10. By setting the above structure, the ejected material can be prevented from overflowing to avoid thermal runaway, which is conducive to maintaining the stability of the battery pack 10 during operation.

[0066] In one embodiment, the reset member 24 includes a spring. Since the spring will deform when subjected to an external force, it will quickly restore its original shape and size once the external force disappears. This characteristic enables the spring to maintain its stability and functionality in various dynamic environments. In addition, the spring will store elastic potential energy during the deformation process, and when the external force disappears, this potential energy will be released, allowing the spring to return to its original state. In this way, the baffle 23 can be rotated from the open position to the blocked position, thereby restoring the blocking function. Optionally, the reset member 24 can also be set to other structural forms such as a rotating rod, as long as the reset requirements of the baffle 23 can be met.

[0067] In one embodiment, the battery module further includes: two end plates 40, which are respectively arranged at the two ends of the battery cell group 10 along the length direction of the battery cell group 10; a fixing member 50, which is wound around the battery cell group 10 and the two end plates 40, and the fixing member 50 is used to fix the battery cell group 10 and the two end plates 40; and a heat conductor 60, which is arranged between the end plate 40 and the battery cell group 10. The material of the heat conductor 60 can be set to be a heat-conducting silica gel or a phase change sheet. The phase change sheet is also called a phase change material or a smart material. It is a material that can produce phase change and morphological changes by changing temperature. Its structure is usually composed of a layer of phase change material sandwiched between two layers of metal foil or plastic film. Common phase change materials include Ge2Sb2Te5, etc. This material can change from a crystalline state to an amorphous state, or from an amorphous state to a crystalline state within a certain temperature range, thereby realizing changes in performance such as capacitance, resistance, and inductance. The working principle of the phase change sheet is to use the phase change material to absorb or release heat at the phase change temperature, thereby realizing the storage and release of thermal energy.

[0068] Thermally conductive silicone is a silicone material with thermal conductivity, usually used to conduct heat and improve heat dissipation. It is a silicone made of organic silicone as the main body, with fillers, thermal conductive materials and other polymer materials added. It has good thermal conductivity and electrical insulation properties, will not solidify, and will not conduct electricity, which can avoid risks such as circuit short circuits. Thermally conductive silicone includes room temperature vulcanized and high temperature vulcanized silicone, generally including thermally conductive silicone adhesives, thermally conductive potting glue, and thermally conductive gaskets that have been vulcanized into a certain shape.

[0069] The advantages of thermally conductive silicone are its high thermal conductivity, stability and durability, good filling performance, extremely low resistance and chemical resistance. Compared with other common heat dissipation materials, such as thermal paste and thermal pads, thermally conductive silicone usually has a higher thermal conductivity, can more effectively transfer heat and reduce temperature, and improve heat dissipation efficiency. In addition, it can maintain stable performance under extreme temperatures, has good aging resistance and long service life. Therefore, it can be selected according to the use requirements of the device in different environments, so as to maximize the use range of the device.

[0070] In the second aspect, an embodiment of the present invention provides a battery pack, which includes: a box body 70; a liquid cooling plate 80, which is arranged at the bottom of the box body 70, and the box body 70 and the liquid cooling plate 80 together enclose a receiving cavity; the above-mentioned battery module, the battery module is arranged in the receiving cavity, and the battery module is fixedly connected to the liquid cooling plate 80.

[0071] By applying the technical solution of the present invention, a plurality of protective members 20 are provided, and the protective members 20 are arranged in a one-to-one correspondence with the battery cell group 10, and the battery cell group 10 is arranged in the accommodating space 21 of the protective member 20, so that when the battery cell group 10 has thermal runaway, the protective member 20 can effectively block sparks or electrolytes from spraying out from the side of the protective member 20, and prevent flames, gases and high-temperature particles from spraying out to the surroundings after thermal runaway. In this way, the heat can be isolated inside the battery cell group 10, and the heat can be prevented from being transferred to other adjacent battery cell groups 10, thereby reducing the risk of heat diffusion. At the same time, a guide channel 22 is provided on the top of the protective member 20. When the electrolyte is ejected through the pressure relief valve of the battery cell unit 11, the electrolyte is guided through the guide channel 22, so that the internal pressure of the battery cell group 10 can be balanced to reduce safety risks such as fire and corrosion, thereby improving the safety performance of the battery module and the stability during operation.

[0072] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0073] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0074] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0075] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0076] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery module, characterized in that: The battery module comprises: At least one battery cell group, the battery cell group having a plurality of battery cell units arranged at intervals, and the top of the battery cell unit having an explosion-proof valve; At least one protective member, the protective member has a accommodating space, the battery cell group is arranged in the accommodating space, the top of the protective member has a guide channel penetrating along the height direction of the battery cell group, and the guide channel is used to guide the electrolyte sprayed out of the explosion-proof valve.

2. The battery module according to claim 1, characterized in that: The protective member further comprises a blocking piece, which is movably connected to the protective member and can block or open the guide channel.

3. The battery module according to claim 2, characterized in that: The baffle is rotatably arranged on the protective member, and the rotation axis of the baffle is perpendicular to the height direction of the battery cell group.

4. The battery module according to claim 2, characterized in that: The protective member further comprises a reset member, one end of which is connected to the protective member, and the other end of which is connected to the blocking piece, and the reset member is used to apply a force to the blocking piece to block the guide channel.

5. The battery module according to claim 4, characterized in that: A liquid collecting groove is also arranged on the top of the protective member. The liquid collecting groove is spaced apart from the flow guide channel and is recessed toward the direction of the battery cell group. The liquid collecting groove is used to contain the electrolyte sprayed out of the explosion-proof valve.

6. The battery module according to any one of claims 1 to 5, characterized in that: The cross-sectional shape of the flow guide channel along the length direction of the battery cell group is the same as the cross-sectional shape of the explosion-proof valve along the length direction of the battery cell group.

7. The battery module according to any one of claims 1 to 5, characterized in that: The cross-sectional area of ​​the flow guide channel along the length direction of the battery cell group is S1, the cross-sectional area of ​​the explosion-proof valve along the length direction of the battery cell group is S2, and S1≥S2.

8. The battery module according to any one of claims 1 to 5, characterized in that: The material of the protective element includes ceramic felt.

9. The battery module according to any one of claims 1 to 5, characterized in that: The battery module includes a plurality of the battery cell groups and a plurality of the protective members, the plurality of the battery cell groups are arranged at intervals along a first direction, and the protective members are arranged in one-to-one correspondence with the battery cell groups.

10. The battery module according to claim 5, characterized in that: The protective element comprises: roof; At least one side plate, the side plate and the top plate enclose the accommodating space, wherein the baffle, the reset member and the liquid collecting tank are arranged on the top plate, and the guide channel is arranged on the top plate through the height direction of the battery cell group.

11. The battery module according to claim 10, characterized in that: The height of the side plate is higher than the height of the top plate at a side away from the battery cell group.

12. The battery module according to claim 4, characterized in that: The return member comprises a spring.

13. The battery module according to claim 1, characterized in that: The battery module also includes: Two end plates are respectively arranged at two ends of the battery cell group along the length direction of the battery cell group; A fixing member, wound around the battery cell group and the two end plates, the fixing member being used to fix the battery cell group and the two end plates; A heat conducting member is arranged between the end plate and the battery cell group.

14. A battery pack, characterized in that: The battery pack comprises: Box; A liquid cooling plate is arranged at the bottom of the box body, and the box body and the liquid cooling plate are together enclosed to form a receiving cavity; The battery module according to any one of claims 1 to 13, wherein the battery module is arranged in the accommodating cavity, and the battery module is fixedly connected to the liquid cooling plate.

Images