Battery cell assembly and energy storage battery

Abstract

The embodiment of the application discloses a kind of battery cell assembly and energy storage battery, it is related to new energy equipment technical field, wherein, battery cell assembly includes pole core and side support sheet, the side support sheet is close to the side wall of the pole core Settings, the material of the side support sheet is high-temperature-resistant material quality. Wherein, the side support sheet is provided with flow guide groove towards the side of the pole core, the flow guide groove is set along the length direction of the side support sheet. The technical scheme provided in the embodiment of the application aims at improving the safety performance and practicality of battery cell assembly.

Description

Technical Field

[0001] The embodiments in this application relate to the field of new energy equipment technology, and in particular to a battery cell assembly and an energy storage battery. Background Technology

[0002] In related technologies, the cells of energy storage batteries can be equipped with explosion-proof valves on their casings. This allows the energy storage battery to release pressure in the event of faults such as thermal runaway, preventing excessive pressure buildup and potential explosion.

[0003] However, current energy storage batteries cannot effectively release the gas generated inside the cell through the explosion-proof valve when a failure occurs, resulting in a low depressurization rate inside the cell, which reduces the safety performance and practicality of the energy storage battery. Utility Model Content

[0004] Several embodiments in this application propose a cell assembly and an energy storage battery, aiming to improve the safety performance and practicality of the cell assembly.

[0005] One embodiment of this application provides a battery cell assembly including a core and a side support plate. The side support plate is disposed close to the sidewall of the core and is made of a high-temperature resistant material. A flow guide groove is provided on the side of the side support plate facing the core, and the flow guide groove extends along the length of the side support plate.

[0006] In one embodiment, the side support plate includes at least two flow channels, which are arranged at intervals.

[0007] In one embodiment, the width of the guide groove is gradually reduced along the direction away from the pole core.

[0008] In one embodiment, the side support is made of at least one of polyetheretherketone, polytetrafluoroethylene, polyetherketone, polyphenylene sulfide, polyetheretherketoneketone, and polyimide.

[0009] In one embodiment, the cell assembly includes two side supports, which are respectively disposed on opposite sides of the electrode core.

[0010] In one embodiment, the cell assembly further includes a covering sheet, which is staggered with the side support sheet and cooperates with the side support sheet to wrap the electrode core.

[0011] In one embodiment, the battery cell assembly further includes a housing, the housing having an accommodating space, the electrode core and the side support plate being disposed within the accommodating space, and the side support plate being made of an insulating material.

[0012] In one embodiment, the housing includes a housing body and a bottom cover plate. The housing body has the accommodating space inside. One side of the housing body has a mounting hole communicating with the accommodating space. The bottom cover plate is connected to the housing body and is located in the mounting hole. The bottom cover plate is provided with an explosion-proof valve.

[0013] An embodiment of this application also proposes an energy storage battery, which includes the cell assembly described above.

[0014] In the various embodiments provided in this application, side support plates are provided on the sidewalls of the electrode core. These side support plates can provide a certain degree of support and fixation for the electrode core. By making the side support plates from high-temperature resistant materials and providing a flow guide groove on the side of the side support plates facing the electrode core, the side support plates can be effectively prevented from melting or deforming due to heat when the energy storage battery experiences thermal runaway or other faults. This prevents the exhaust channels inside the battery cell assembly from being blocked, allowing the high-temperature gas generated inside the battery cell assembly to be quickly conducted and discharged to the outside of the battery cell assembly through the flow guide groove. This ensures the stable discharge of gas generated during thermal runaway of the battery cell assembly and effectively improves the safety performance and practicality of the battery cell assembly. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the battery cell assembly provided in this application;

[0017] Figure 2 This is an exploded view of the structure of an embodiment of the battery cell assembly provided in this application;

[0018] Figure 3 A cross-sectional view of an embodiment of the battery cell assembly provided in this application;

[0019] Figure 4 This is an exploded view of another embodiment of the battery cell assembly provided in this application.

[0020] Explanation of icon numbers:

[0021] 100. Battery cell assembly; 10. Electrode core; 11. Arrangement gap; 30. Side support plate; 31. Flow guide groove; 50. Cover plate; 70. Housing; 71. Housing body; 711. Mounting hole; 73. Bottom cover plate; 75. Explosion-proof valve. Detailed Implementation

[0022] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of several embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that if multiple embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0025] In related technologies, energy storage battery cells can be equipped with explosion-proof valves on their casings. These valves allow for pressure relief in the event of faults such as thermal runaway, preventing excessive pressure buildup and potential explosions. However, current energy storage batteries do not effectively allow gas generated within the cell to be released through the explosion-proof valves during faults, resulting in a low pressure relief rate and reduced practicality and safety performance. To address these issues, this application proposes a cell assembly 100.

[0026] Please see Figures 1 to 4 In one embodiment of this application, the battery cell assembly 100 includes an electrode core 10 and a side support plate 30. The side support plate 30 is disposed close to the side wall of the electrode core 10 and is made of a high-temperature resistant material.

[0027] In this application, the electrode core 10 may include multiple positive electrode sheets, negative electrode sheets, and separators stacked side by side. The side-by-side stacking of these sheets creates an arrangement gap 11 between adjacent sheets. When the energy storage battery experiences thermal runaway or other faults, the gas inside the cell assembly 100 can diffuse outwards through the arrangement gap 11, allowing the gas to flow smoothly to the explosion-proof valve 75 for discharge, thus achieving reliable early warning and protection during faults. Furthermore, a side support plate 30 can be provided in the cell assembly 100, close to the side wall of the electrode core 10. This side support plate 30 provides support and fixation for the electrode core 10, effectively preventing deformation of the electrode core 10 due to stress, ensuring the overall structural stability of the cell assembly 100, and achieving stable operation of the energy storage battery.

[0028] Understandably, in current battery cells, the side support plates are usually made of materials that are not resistant to high temperatures. When the energy storage battery fails, the high-temperature gas generated by the cell flows through the side support plates, which can easily cause the side support plates to melt. Furthermore, the molten side support plates can easily flow to the explosion-proof valve and solidify, or they can easily block the arrangement gaps within the electrode core, causing the gas passages within the cell to be blocked and affecting the gas discharge and pressure relief within the cell. At the same time, the melted side support plates can easily generate certain harmful fumes, and the emission of these harmful fumes can have a certain impact on the environment.

[0029] Therefore, by using a high-temperature resistant material for the side support plate 30 in this application, the side support plate 30 can achieve better temperature resistance, effectively preventing the side support plate 30 from melting or deforming under the action of high-temperature airflow, and maintaining the overall structural shape of the side support plate 30 unchanged. This allows the high-temperature airflow generated by the energy storage battery during thermal runaway or other faults to diffuse outward from the arrangement gap 11 of the electrode core 10 and then stably flow along the gap between the side wall of the electrode core 10 and the side support plate 30 to the explosion-proof valve 75 for discharge. At the same time, it can effectively prevent the side support plate 30 from melting and solidifying under high temperature, thus blocking the explosion-proof valve 75, ensuring unobstructed air passage within the cell assembly 100, achieving stable and reliable pressure relief of the energy storage battery, ensuring the safety performance of the energy storage battery, and effectively improving the structural stability and reliability of the energy storage battery.

[0030] It should be noted that the high-temperature resistant material used in the side support plate 30 can be characterized by its ability to remain undissolved or deformed for more than 15 minutes in a temperature environment below 300°C. This high-temperature resistant material can include, but is not limited to, polyetheretherketone, polytetrafluoroethylene, polyetherketone, polyphenylene sulfide, polyetheretherketoneketone, polyimide, etc. Since most energy storage batteries operate in a normal temperature environment, and the temperature of energy storage batteries during thermal runaway is usually below 200°C, and the time from thermal runaway to the opening of the explosion-proof valve is usually 5 to 10 minutes, by using this high-temperature resistant material to form the side support plate 30, it is possible to effectively prevent the side support plate 30 from being affected by temperature during the operation of the energy storage battery, avoid deformation or melting of the side support plate 30, and ensure the stable support and venting function of the side support plate 30 when the cell assembly 100 fails.

[0031] In addition, the side support plate 30 can be arranged toward the side wall of the electrode core 10 forming the arrangement gap 11, so that the gas diffused from the arrangement gap 11 in the electrode core 10 can be directly blocked and guided by the high temperature resistant side support plate 30, so that the gas can flow closer to the surface of the side support plate 30 to the explosion-proof valve 75 for discharge; or the side support plate 30 can be arranged around the periphery of the electrode core 10, so that the side support plate 30 can guide the gas to the explosion-proof valve 75 for discharge more stably, further improving the structural stability and reliability of the cell assembly 100.

[0032] In one embodiment of this application, a side support plate 30 is provided on the side wall of the electrode core 10. The side support plate 30 can provide a certain support and fixation for the electrode core 10. By making the side support plate 30 into a high-temperature resistant material and providing a guide groove 31 on the side of the side support plate 30 facing the electrode core 10, the side support plate 30 can be effectively prevented from melting or deforming due to heat when the energy storage battery experiences thermal runaway or other faults. This prevents the exhaust channel inside the cell assembly 100 from being blocked, allowing the high-temperature gas generated inside the cell assembly 100 to be quickly conducted and discharged to the outside of the cell assembly 100 through the guide groove 31. This ensures the stable discharge of gas generated when the cell assembly 100 experiences thermal runaway, effectively improving the safety performance and practicality of the cell assembly 100.

[0033] See Figure 1 and Figure 2 In one embodiment of this application, the side support plate 30 is provided with a flow guide groove 31 on the side facing the pole core 10, and the flow guide groove 31 extends along the length direction of the side support plate 30.

[0034] In this embodiment, by providing a guide groove 31 on the side support plate 30, the opening of the guide groove 31 can be connected to the electrode arrangement gap 11. By extending the guide groove 31 along the length of the side support plate 30, the guide groove 31 can play a certain role in conducting airflow. This is beneficial for the gas in the cell assembly 100 to be more stably transported and discharged through the guide groove 31, and for the airflow to be conducted to the explosion-proof valve 75 of the bottom cover plate 73 of the cell assembly 100 more quickly. This allows the cell assembly 100 to achieve a faster exhaust and pressure relief effect, and to release the gas generated in the cell assembly 100 due to faults in a timely manner. This better avoids excessive internal pressure in the energy storage battery when a fault occurs, and further improves the practicality and structural reliability of the cell assembly 100.

[0035] Furthermore, the guide groove 31 enables the side support plate 30 and the electrode core 10 to fit more tightly together, achieving better support and fixation of the electrode core 10 by the side support plate 30. This effectively avoids the possibility of blockage of the air passage in the battery cell assembly 100 due to the tight fit between the side support plate 30 and the electrode core 10, ensuring stable gas emission of the battery cell assembly 100 in case of failure, and further improving the safety performance of the battery cell assembly 100.

[0036] See Figure 2 In one embodiment of this application, the side support plate 30 includes at least two guide grooves 31, which are arranged at intervals.

[0037] By setting multiple parallel guide grooves 31 on the side support plate 30, the guide space on the side support plate 30 can be increased, so that the gas generated in the cell assembly 100 can flow through the guide grooves 31 to the explosion-proof valve 75 for discharge more quickly, better preventing excessive pressure in the energy storage battery, and further improving the practicality and structural reliability of the cell assembly 100.

[0038] Furthermore, when the electrode core 10 has multiple parallel arrangement gaps 11, the cell assembly 100 can also arrange the multiple arrangement gaps 11 on the electrode core 10 to correspond one-to-one with multiple flow guide grooves 31, so that the gas generated in the cell assembly 100 can flow more quickly and stably from the arrangement gaps 11 to the flow guide grooves 31 for guidance, better reducing the blockage of the airflow path, so that the cell assembly 100 can achieve better structural stability and safety performance.

[0039] In one embodiment of this application, the width of the guide groove 31 is gradually reduced along the direction away from the pole core 10.

[0040] In this embodiment, by gradually reducing the width of the guide groove 31 in the direction away from the electrode core 10, the guide groove 31 can be configured as an inverted triangular groove or a semi-circular groove. This allows the side support plate 30 to be more easily removed from the mold when it is manufactured using a mold, which helps to improve the production and processing convenience of the side support plate 30 and further improves the production efficiency and practicality of the battery cell assembly 100.

[0041] Furthermore, by gradually reducing the width of the guide groove 31 in the direction away from the electrode core 10, it is also beneficial to allow the airflow flowing into the guide groove 31 to better converge and discharge within the guide groove 31, reducing the possibility of some airflow being trapped within the guide groove 31 due to diffusion. This allows the airflow to be guided and discharged more quickly through the guide groove 31, improving the gas emission rate of the battery cell assembly 100 in the event of thermal runaway or other faults, preventing excessive gas pressure within the battery cell assembly 100, and further improving the safety performance and practicality of the battery cell assembly 100.

[0042] In one embodiment of this application, the side support 30 is made of at least one of polyetheretherketone, polytetrafluoroethylene, polyetherketone, polyphenylene sulfide, polyetheretherketoneketone, and polyimide.

[0043] It is understandable that the melting point range of polyetheretherketone (PEEK) is typically above 340°C, that of polytetrafluoroethylene (PTFE) is typically 320°C to 327°C, that of polyetherketone (PEK) is typically above 330°C, that of polyphenylene sulfide (PPS) is typically 285°C to 300°C, that of polyetheretherketone ketone (PEKK) is typically 340°C to 345°C, and that of polyimide is typically above 400°C. By using at least one of PEEK, PTE, PEEK, PPS, and polyimide to form the side support plate 30, it can have higher high-temperature resistance, better preventing the side support plate 30 from melting or deforming under the action of high-temperature airflow. This allows the energy storage battery to maintain a more stable and reliable overall structure, further improving the practicality and structural reliability of the cell assembly 100.

[0044] The side support plate 30 can be made of one of the following materials: polyetheretherketone, polytetrafluoroethylene, polyetherketone, polyphenylene sulfide, polyetheretherketone, and polyimide; or the side support plate 30 can be made of a combination of at least two of these materials. Using a combination of at least two high-temperature resistant materials can give the side support plate 30 better material properties and further improve the overall structural stability and reliability of the battery cell assembly 100.

[0045] See Figure 1 , Figure 2 and Figure 3In one embodiment of this application, the battery cell assembly 100 includes two side supports 30, which are respectively disposed on opposite sides of the electrode core 10.

[0046] In this embodiment, the sheets inside the electrode core 10 can be stacked in parallel in sequence. At this time, the arrangement gap 11 formed inside the electrode core 10 can penetrate through the opposite sides of the electrode core 10. By making the cell assembly 100 include two side support pieces 30, the two side support pieces 30 can be respectively attached to the opposite sides of the electrode core 10, and the two side support pieces 30 are respectively attached to the sides facing the electrode core 10 where the arrangement gap 11 is formed. This allows the two side support pieces 30 to clamp and support the electrode core 10, thereby achieving a better support and fixation effect of the side support pieces 30 on the electrode core 10, and further improving the structural stability and reliability of the cell assembly 100.

[0047] In addition, when the side support plate 30 is provided with a guide groove 31 to conduct the gas flowing out of the arrangement gap 11, the two side support plates 30 can be used to conduct the gas more quickly on the opposite sides of the electrode core 10. This is beneficial to improve the gas emission rate of the cell assembly 100 in case of failure, better avoid the accumulation of gas in the cell assembly 100, and further improve the safety performance and practicality of the cell assembly 100.

[0048] See Figure 2 and Figure 3 In one embodiment of this application, the cell assembly 100 further includes a covering sheet 50, which is staggered with the side support sheet 30 and cooperates with the side support sheet 30 to wrap the electrode core 10.

[0049] It is understood that the electrode core 10 can have two opposing first sidewalls, and two second sidewalls and two surfaces connecting the two first sidewalls. In this case, the arrangement gap 11 formed by multiple sheets within the electrode core 10 can penetrate through the first and second sidewalls. The side support plate 30 can be positioned close to the first sidewall of the electrode core 10, and a tab connecting the electrode core 10 to the electrode post can be provided on one of the second sidewalls. By providing a covering plate 50 to the cell assembly 100, and having the covering plate 50 and the side support plate 30 cooperate to wrap the electrode core 10, the covering plate 50 can be used to adhere to and wrap the second sidewall and two surfaces of the electrode core 10, and the side support plate 30 can be used to adhere to the first sidewall of the electrode core 10. This allows the covering plate 50 and the side support plate 30 to alternately wrap the electrode core 10, achieving better protection for the electrode core 10, effectively reducing the impact of external forces on the electrode core 10, and ensuring the stable operation of the cell assembly 100. Meanwhile, with the full coverage of the electrode core 10 by the covering sheet 50 and the side support sheet 30, the cell assembly 100 can be better combined to form an overall structure, which is conducive to maintaining the stability of the cell assembly 100 during the assembly process of the energy storage battery, preventing the cell assembly 100 from being installed off-center or deformed, ensuring the stable operation of the energy storage battery, and further improving the structural stability and reliability of the cell assembly 100.

[0050] See Figure 3 and Figure 4 In one embodiment of this application, the battery cell assembly 100 further includes a housing 70, which has an accommodating space. The electrode core 10 and the side support plate 30 are disposed in the accommodating space, and the side support plate 30 is made of an insulating material.

[0051] In this embodiment, by assembling the electrode core 10 and side support plate 30 of the battery cell assembly 100 within the accommodating space of the housing 70, the housing 70 can form an overall protective structure for the battery cell assembly 100, better preventing the electrode core 10 from being affected by the external environment and ensuring the stable and reliable operation of the battery cell assembly 100.

[0052] By using a material with certain high-temperature resistance and insulation properties, the side support plate 30 can not only provide fixed support for the electrode core 10, but also form an insulating layer between the electrode core 10 and the housing 70, preventing the electrical energy of the electrode core 10 from being conducted to the housing 70, thus better ensuring the stable operation of the battery cell assembly 100. The side support plate can abut against the inner wall of the accommodating space to provide more stable support for the electrode core. Using the side support plate 30 to form an insulating layer between the electrode core 10 and the housing 70 can also effectively reduce the amount of insulating material required within the housing 70, which helps to reduce the production cost of the battery cell assembly 100, simplify the overall structure of the battery cell assembly 100, and further improve the practicality and structural reliability of the battery cell assembly 100.

[0053] See Figure 4 In one embodiment of this application, the housing 70 includes a housing body 71 and a bottom cover plate 73. The housing body 71 has an accommodating space inside, and a mounting hole 711 communicating with the accommodating space is provided on one side of the housing body 71. The bottom cover plate 73 is connected to the housing body 71 and is provided in the mounting hole 711. An explosion-proof valve 75 is provided on the bottom cover plate 73.

[0054] In this embodiment, the shell body 71 can be a hollow cylindrical structure. Using the mounting hole 711 on one side of the shell body 71, the electrode core 10 and side support plates 30, among other structures, can be assembled into the accommodating space through the mounting hole 711, facilitating the assembly of the battery cell assembly 100 and further improving its assembly convenience. By placing the side support plates 30 inside the shell body 71, they can form an insulating layer between the electrode core 10 and the shell body 71. The bottom cover plate 73 is connected to the shell body 71, and its position corresponds to the mounting hole 711, allowing it to open or close the mounting hole 711. This allows the bottom cover plate 73 and the shell body 71 to better close and protect the electrode core 10, achieving a better protective effect for the battery cell assembly 100. At this time, the bottom cover plate 73 can be arranged opposite to the arrangement gap 11 of the electrode core 10 and the side support plate 30, and the guide groove 31 on the side support plate 30 can extend in the direction toward the bottom cover plate 73. By setting the explosion-proof valve 75 on the bottom cover plate 73, when the cell structure experiences thermal runaway or other faults, the gas generated in the cell assembly 100 can be conducted and flowed to the bottom cover plate 73 through the gap between the electrode core 10 and the side support plate 30 and the guide groove 31, and discharged through the explosion-proof valve 75. This effectively avoids the accumulation of gas in the cell assembly 100, ensures the rapid discharge of gas in the cell assembly 100, and further improves the safety performance and structural reliability of the cell assembly 100.

[0055] Specifically, a groove structure communicating with the guide groove 31 can be provided on the bottom cover plate 73, and this groove structure can be connected to the explosion-proof valve 75, so that the high-temperature gas generated when the energy storage battery experiences thermal runaway can be quickly conducted through the guide groove 31 to the explosion-proof valve 75 on the bottom cover plate 73 for discharge; or, a certain gap can be made between the bottom cover plate 73 and the electrode core 10, and the guide groove 31 can be connected to the gap, so that the guide groove 31 can quickly conduct the high-temperature gas to the gap, so that the high-temperature gas can be discharged more quickly through the explosion-proof valve 75, ensuring the rapid discharge of high-temperature gas in the cell assembly 100 and effectively improving the safety performance of the energy storage battery.

[0056] This application also proposes an energy storage battery, which includes a cell assembly 100. The specific structure of the cell assembly 100 is as described in the above embodiments. Since this energy storage battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0057] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An electrochemical cell assembly, comprising: include: Extreme core; Side support plate, the side support plate is disposed close to the side wall of the electrode core, and the side support plate is made of high temperature resistant material; The side support plate has a flow guide groove on the side facing the electrode core, and the flow guide groove extends along the length direction of the side support plate.

2. The cell assembly of claim 1, wherein, The side support plate includes at least two flow guide grooves, which are arranged at intervals.

3. The cell assembly of claim 1, wherein, The width of the guide groove gradually decreases in the direction away from the pole core.

4. The cell assembly as described in any one of claims 1 to 3, characterized in that, The battery cell assembly includes two side supports, which are respectively disposed on opposite sides of the electrode core.

5. The cell assembly as described in any one of claims 1 to 3, characterized in that, The cell assembly also includes a covering sheet, which is staggered with the side support sheet and cooperates with the side support sheet to wrap the electrode core.

6. The cell assembly as described in any one of claims 1 to 3, characterized in that, The battery cell assembly also includes a housing, which has an accommodating space. The electrode core and the side support plate are disposed in the accommodating space, and the side support plate is made of an insulating material.

7. The cell assembly as described in claim 6, characterized in that, The housing includes a main body and a bottom cover plate. The main body has the accommodating space inside. One side of the main body has a mounting hole that communicates with the accommodating space. The bottom cover plate is connected to the main body and is located in the mounting hole. The bottom cover plate is provided with an explosion-proof valve.

8. An energy storage battery, characterized in that, The energy storage battery includes a cell assembly as described in any one of claims 1 to 7.

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