Single battery and energy storage device
By dividing the battery cell into multiple pole groups and setting up an explosion-proof structure on the battery cover and shell, the problems of high complexity in lithium-ion batteries and high risk of thermal runaway are solved, and a high capacity and safe single-cell design is achieved.
Patent Information
- Application Number
- CN202422235241.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-12
AI Technical Summary
The increase in the internal cell length of existing lithium-ion batteries leads to high manufacturing complexity and low accuracy, large heat, high risk of thermal runaway, and poor gas emissions lead to poor safety.
The battery cell is divided into multiple pole groups, and an explosion-proof structure on the battery cover plate and the shell is set to ensure that there are pressure relief channels at both ends of each pole group, and the gas discharge is accelerated by the gap between the shell and the battery cell, and the strength of the exhaust passage structure is enhanced.
It improves battery capacity and manufacturing accuracy, simplifies manufacturing processes, shortens gas exhaust stroke, and enhances the pressure relief capacity and safety of single-unit batteries.
Smart Images
Figure CN223079297U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a single battery and an energy storage device. Background Art
[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. At present, the requirements for the use performance and safety of lithium-ion batteries are increasing day by day.
[0003] In order to improve their own capacity and energy density, the existing lithium-ion batteries are gradually developing towards long lithium-ion batteries, that is, the length of the battery cells inside the lithium-ion batteries is getting larger and larger. This will lead to complex manufacturing processes and low manufacturing precision of the battery cells. Moreover, the proportion of the battery cells inside the existing lithium-ion batteries is getting higher and higher, making the capacity and energy density of a single lithium-ion battery larger and larger; but this also causes more and more heat during the operation or charging of a single lithium-ion battery, and the risk of thermal runaway is relatively high. If a single lithium-ion battery undergoes thermal runaway, the heat dissipation air path is long, and the gas cannot be released quickly, resulting in a rapid increase in the internal pressure of the lithium-ion battery and affecting the safety performance of the battery cells.
[0004] Therefore, there is an urgent need for a new type of single battery to solve the above technical problems. Summary of the Utility Model
[0005] An object of the utility model is to provide a single battery, which can improve the pressure relief ability of the single battery while increasing the battery capacity, thereby improving the safety of the single battery.
[0006] To achieve the above object, the utility model adopts the following technical solutions:
[0007] The single battery includes:
[0008] A battery cell group, including at least two pole groups connected in sequence along a first direction;
[0009] A housing, having openings at both ends along the first direction, and the battery cell group can be placed in the housing along the openings;
[0010] Two battery covers, corresponding to the openings one by one, the battery covers are hermetically connected to the openings, and a first explosion-proof structure is provided on the battery covers, and the first explosion-proof structure is used for exhaust and pressure relief;
[0011] At least two second explosion-proof structures, symmetrically arranged on both sides of the housing along a second direction, and corresponding to the connection parts of two adjacent pole groups, the second direction is perpendicular to the first direction, and the second explosion-proof structures are used for exhaust and pressure relief.
[0012] Optionally, at least one mounting hole is provided on both sides of the above-mentioned housing along the above-mentioned second direction, and each of the above-mentioned mounting holes is correspondingly provided with one of the above-mentioned second explosion-proof structures. The above-mentioned second explosion-proof structure includes a first explosion-proof valve and a first protective film. The above-mentioned first explosion-proof valve is hermetically connected to the above-mentioned mounting hole, and the above-mentioned first protective film is arranged on the side wall of the corresponding above-mentioned housing and covers the above-mentioned first explosion-proof valve.
[0013] Optionally, at least one mounting groove is provided on both sides of the above-mentioned housing along the above-mentioned second direction. The above-mentioned mounting hole is provided at the bottom of the above-mentioned mounting groove, and the above-mentioned first protective film is arranged in the above-mentioned mounting groove; the dimension of the above-mentioned mounting groove along the above-mentioned second direction is greater than the dimension of the above-mentioned first protective film along the above-mentioned second direction.
[0014] Optionally, side plates are provided on both sides of the above-mentioned electrode group along the third direction. The above-mentioned first direction, the above-mentioned second direction, and the above-mentioned third direction are perpendicular to each other in pairs. A gap is provided between the circumferential side wall of the above-mentioned side plate and the circumferential side wall of the above-mentioned electrode group to form an exhaust passage.
[0015] Optionally, the above-mentioned side plate includes a plurality of first plates and a plurality of second plates. The above-mentioned first plates and the above-mentioned second plates are alternately connected. The dimension of the above-mentioned second plate along the above-mentioned second direction is smaller than the dimension of the above-mentioned first plate along the above-mentioned second direction, so that the above-mentioned second plate and the gas storage area of the above-mentioned exhaust passage are larger.
[0016] Optionally, a support assembly is provided between the two above-mentioned electrode groups. The above-mentioned support assembly is used to support the connection part of two adjacent above-mentioned electrode groups.
[0017] Optionally, the above-mentioned support assembly includes two symmetrically arranged support members. The above-mentioned support members are provided with grooves, and the above-mentioned grooves of the two above-mentioned support members are buckled to form a support cavity. The connection part of the pole lugs of two adjacent above-mentioned electrode groups is arranged in the above-mentioned support cavity.
[0018] Optionally, a communication cavity is provided on one side of the above-mentioned support member facing the above-mentioned second explosion-proof structure. Exhaust holes are provided on both sides of the above-mentioned communication cavity along the third direction to communicate the gap between the above-mentioned battery cell group and the above-mentioned housing with the above-mentioned second explosion-proof structure. The above-mentioned first direction, the above-mentioned second direction, and the above-mentioned third direction are perpendicular to each other in pairs.
[0019] Optionally, a communication hole is provided on one side of the above-mentioned communication cavity away from the above-mentioned second explosion-proof structure to communicate the above-mentioned communication cavities of the two above-mentioned support members.
[0020] Another object of the present utility model is to provide an energy storage device, which can improve the pressure relief ability of a single battery while increasing the battery capacity, thereby improving the safety of the single battery.
[0021] To achieve this purpose, the present utility model adopts the following technical solutions:
[0022] An energy storage device, including the above single battery cells.
[0023] Advantages of the present utility model:
[0024] The present utility model provides a single battery cell and an energy storage device. The battery cell group is divided into a form where multiple pole groups are connected. This not only increases the capacity of the single battery cell but also simplifies the manufacturing complexity of the pole group and improves the manufacturing precision of the pole group. On this basis, in addition to setting a first explosion-proof structure on the battery cover plate, at least two second explosion-proof structures are provided on the housing of the single battery cell in this embodiment, so as to correspondingly set explosion-proof pressure relief structures at the connections of adjacent pole groups, such that both ends of each pole group in the first direction have explosion-proof pressure relief structures. Thus, when gas is generated due to thermal runaway of a single pole group or the entire battery cell group, the gas can flow through the gap between the housing and the battery cell group to the first explosion-proof structure or the second explosion-proof structure for discharge, shortening the travel of the gas exhaust airway, accelerating the gas discharge efficiency, improving the explosion-proof pressure relief effect of the single battery cell, and thus enhancing the safety of the single battery cell. Description of the Drawings
[0025] Figure 1 is a partial explosion view of the single battery cell provided by the specific embodiment of the present utility model;
[0026] Figure 2 is an explosion view of the single battery cell provided by the specific embodiment of the present utility model;
[0027] Figure 3 is a top view of the single battery cell provided by the specific embodiment of the present utility model;
[0028] Figure 4 is a side view of the single battery cell provided by the specific embodiment of the present utility model;
[0029] Figure 5 is Figure 2 a partial enlarged view of part A in
[0030] Figure 6 is Figure 3 a sectional view taken along line B - B in
[0031] Figure 7 is Figure 4 a sectional view taken along line C - C in
[0032] Figure 8 is an axonometric view of the support assembly provided by the specific embodiment of the present utility model;
[0033] Figure 9 is a side view of the support assembly provided by the specific embodiment of the present utility model.
[0034] In the figure:
[0035] 10. Battery cell group; 11. Electrode group; 111. Tab; 12. Support assembly; 121. Support member; 1211. Communication cavity; 1212. Exhaust hole; 1213. Communication hole; 1214. Groove; 1215. Rib; 13. Support plate
[0036] 20. Housing; 21. Mounting hole; 22. Mounting groove
[0037] 30. Battery cover plate; 31. First explosion-proof structure
[0038] 40. Second explosion-proof structure; 41. First explosion-proof valve; 42. First protective film
[0039] 50. Side plate; 51. First plate; 52. Second plate
[0040] 60. Exhaust passage; 70. Insulating film; 71. Slit Detailed implementation manners
[0041] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.
[0042] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0043] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the", and "on the" second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the", and "under the" second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.
[0044] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0045] The following refers to Figures 1 to 9 to introduce the single cell and energy storage device provided by the present utility model.
[0046] It should be noted that the first direction is the Figure 1 X direction in Figure 1 the second direction is the Figure 1 Y direction in
[0047] Please refer to Figures 1 to 4 , specifically, the single cell includes a housing 20, a cell group 10, two battery covers 30 and at least two second explosion-proof structures 40. Among them, the cell group 10 includes at least two pole groups 11 connected in sequence along the first direction; both ends of the housing 20 along the first direction are provided with openings, and the cell group 10 can be placed in the housing 20 along the openings; the two battery covers 30 are arranged in one-to-one correspondence with the openings, the battery covers 30 are hermetically connected to the openings, and the first explosion-proof structure 31 is provided on the battery covers 30, and the first explosion-proof structure 31 is used for exhausting and relieving pressure; at least two second explosion-proof structures 40 are symmetrically arranged on both sides of the housing 20 along the second direction and are correspondingly arranged at the connection of two adjacent pole groups 11, and the second explosion-proof structure 40 is used for exhausting and relieving pressure.
[0048] In the single cell of this embodiment, the cell group 10 is divided into a form of multiple connected pole groups 11, which not only improves the capacity of the single cell, but also simplifies the manufacturing complexity of the pole groups 11 and improves the manufacturing precision of the pole groups 11; on this basis, in addition to setting the first explosion-proof structure 31 on the battery cover 30 in the single cell of this embodiment, at least two second explosion-proof structures 40 are also provided on the housing 20 to correspondingly arrange explosion-proof and pressure-relieving structures at the connections of adjacent pole groups 11, so that both ends of each pole group 11 along the first direction have explosion-proof and pressure-relieving structures. Thus, when gas is generated due to thermal runaway of a single pole group 11 or the entire cell group 10, the gas can flow through the gap between the housing 20 and the cell group 10 to the first explosion-proof structure 31 or the second explosion-proof structure 40 for discharge, shortening the travel of the gas exhaust airway, accelerating the gas discharge efficiency, improving the pressure-relieving and explosion-proof effect of the single cell, and thus improving the safety of the single cell.
[0049] In some alternative embodiments, at least one reinforcing structure is provided on both sides of the housing 20 along the second direction, and the second explosion-proof structure 40 is disposed on the reinforcing structure to enhance the structural strength of the installation position of the second explosion-proof structure 40, and to prevent a large deformation at the corresponding installation position of the housing 20 during the explosion-proof pressure relief process of the second explosion-proof structure 40, resulting in the inability to be reused again.
[0050] Please refer to Figure 1 and Figure 2 , specifically, at least one mounting hole 21 is provided on both sides of the housing 20 along the second direction, and each mounting hole 21 is correspondingly provided with a second explosion-proof structure 40. The second explosion-proof structure 40 includes a first explosion-proof valve 41 and a first protective film 42. The first explosion-proof valve 41 is sealingly connected to the mounting hole 21, and the first explosion-proof valve 41 is used for the explosion-proof pressure relief of the single battery. The first protective film 42 is disposed on the side wall of the corresponding housing 20 and covers the first explosion-proof valve 41. The first protective film 42 is used to protect the first explosion-proof valve 41. When the electrode group 11 in the housing 20 undergoes thermal runaway, a part of the gas generated by the electrode group 11 can flow to the first explosion-proof valve 41 through the gap between the battery cell group 10 and the housing 20. When the first explosion-proof valve 41 reaches the bursting pressure value, it can be broken open, and the first protective film 42 is flushed open to discharge and relieve the pressure of the gas in the single battery, thereby improving the safety of the single battery.
[0051] Specifically, at least one mounting groove 22 is provided on both sides of the housing 20 along the second direction, and the mounting hole 21 is provided at the bottom of the mounting groove 22 to form a reinforcing structure. The first protective film 42 is disposed in the mounting groove 22; the dimension of the mounting groove 22 along the second direction is greater than the dimension of the first protective film 42 along the second direction, that is, the depth of the mounting groove 22 is less than the thickness of the first protective film 42, so that the second explosion-proof structure 40 does not protrude beyond the outer peripheral surface of the housing 20 of the single battery, avoiding affecting the installation of other structures in the single battery, and also facilitating the assembly and manufacture of the single battery. And the setting of the mounting groove 22 also makes the installation position form a reinforcing structure similar to a reinforcing rib, increasing the structural strength of the housing 20 at the installation position of the second explosion-proof valve.
[0052] Optionally, the depth of the mounting groove 22 is H, the thickness of the first protective film 42 is L, and the wall thickness of the housing 20 is W. 0.2 mm < H < 0.5 mm, 0.1 mm < L < 0.3 mm, 0.4 mm < W < 0.8 mm. These are the preferred dimensions, which not only provide a certain strength for the installation of the second explosion-proof structure 40, but also ensure the flatness of the outer periphery of the entire single battery.
[0053] Optionally, the installation groove 22 is formed by stamping the housing 20, which increases the structural strength of the housing 20 at the installation position of the second explosion-proof valve, avoids the problem of excessive deformation at this installation position during the exhaust pressure relief process due to the relatively thin wall thickness of the housing 20, and improves the reliability of the single cell.
[0054] In some embodiments, an exhaust passage 60 is provided between the inner wall of the battery cell group 10 and the housing 20. Both the first explosion-proof structure 31 and the second explosion-proof structure 40 communicate with the exhaust passage 60. The exhaust passage 60 further increases the guiding property of the gas flow inside the single cell, so that when the electrode group 11 undergoes thermal runaway, the gas generated at each position on the outer periphery of the electrode group 11 can be discharged to the first explosion-proof structure 31 and the second explosion-proof structure 40 for pressure relief.
[0055] Please refer to Figure 2 and Figure 5 , specifically, side plates 50 are provided on both sides of the electrode group 11 along the third direction. A gap is provided between the circumferential side wall of the side plate 50 and the circumferential side wall of the electrode group 11 to form the exhaust passage 60. Such a setting can not only form the exhaust passage 60, but also strengthen the structural strength of the electrode group 11, improve the fixing effect on the electrode group 11, and avoid its displacement and contact with the housing 20, resulting in damage.
[0056] More specifically, the side plate 50 includes a plurality of first plates 51 and a plurality of second plates 52. The first plates 51 and the second plates 52 are alternately connected. The dimension of the second plate 52 along the second direction is smaller than that of the first plate 51, so that the gas storage area of the exhaust passage 60 between the second plate 52 and the side wall of the housing 20 is larger, enabling the exhaust passage 60 to have a gas storage part, increasing the volume of the exhaust passage 60, effectively increasing the gas occupancy space inside the housing 20, delaying the rising speed of the pressure inside the single cell, and further improving the safety of the single cell.
[0057] Please refer to Figure 2 , Figures 5 to 9 , in some embodiments, a support assembly 12 is provided between two electrode groups 11. The support assembly 12 is used to support the connection part between two adjacent electrode groups 11 to improve the connection stability between two adjacent electrode groups 11.
[0058] Specifically, the two adjacent pole groups 11 are connected in series by welding the pole tabs 111. The pole tabs 111 on the side of the pole group 11 facing the other pole group 11 extend along the first direction. The support assembly 12 supports the connection of the pole tabs 111 of the two pole groups 11, so that when the pole tabs 111 of the two pole groups 11 are connected, they are connected after being inserted flatly and overlapping, so as to avoid bending and fixing of the pole tabs 111, shorten the length of the pole tabs 111, improve the space utilization rate, simplify the processing technology, and also reduce the internal resistance.
[0059] In some embodiments, the support assembly 12 includes two symmetrically arranged support members 121. By dividing the support assembly 12 into two support members 121, it is convenient for the installation of the support assembly 12 and can support the connection of two adjacent pole groups 11. Specifically, the support member 121 is provided with a groove 1214. The grooves 1214 of the two support members 121 are buckled to form a support cavity, and the connection of the pole tabs 111 of two adjacent pole groups 11 is arranged in the support cavity. The setting of the groove 1214 provides a receiving position for the pole tabs 111 and also supports the pole tabs 111, improving the connection reliability of the connection of the pole tabs 111 of the two pole groups 11.
[0060] Optionally, the support member 121 has a square structure, so that the surface of the support member 121 in contact with the battery cell is a plane, thus better playing the role of fixing and supporting.
[0061] Optionally, the two support members 121 can be symmetrically connected along the first direction or symmetrically connected along the second direction, both of which can realize the forming and assembling of the support assembly 12 to fix the connection of the pole tabs 111 of the pole group 11.
[0062] In some alternative embodiments, a communication cavity 1211 is opened on the side of the support member 121 facing the second explosion-proof structure 40. Exhaust holes 1212 are arranged on both sides of the communication cavity 1211 along the third direction to communicate the gap between the battery cell group 10 and the housing 20 with the second explosion-proof structure 40, so as to enable the gas generated by the internal thermal runaway of the single battery to be discharged by the second explosion-proof structure 40. And the two support members 121 are symmetrically arranged to ensure that the pressure relief and explosion-proof effects can be achieved on both sides of the single battery along the second direction, avoiding excessive pressure on the other side caused by only setting the second explosion-proof structure 40 on one side, and improving the safety of the single battery.
[0063] In some alternative embodiments, a communication hole 1213 is opened on the side of the communication cavity 1211 away from the second explosion-proof structure 40 to communicate the communication cavities 1211 of the two support members 121, so that the gas on both sides of the single battery is communicated, thereby further avoiding the safety problems caused by uneven pressure on both sides of the single battery along the second direction during thermal runaway, and further improving the safety of the single battery.
[0064] In some embodiments, ribs 1215 are further provided on both sides of the support member 121 along the third direction. The ribs 1215 of the two support members 121 and the body portion of the support member 121 enclose a channel, and the channel is connected to the exhaust channel 60. The arrangement of the ribs 1215 prevents gas leakage, enabling the gas in the exhaust channel 60 of the electrode group 11 to enter the channel and pass through the exhaust holes 1212 into the communication cavity 1211, and then discharged from the communication cavity 1211 through the second explosion-proof structure 40.
[0065] In some embodiments, support plates 13 are further provided at both ends of the battery cell group 10 along the first direction to provide a supporting force for the battery cell group 10, so that when the battery cell group 10 is installed in the housing 20, a force can be applied stably and evenly through the support plates 13, thereby realizing the installation of the battery cell group 10.
[0066] It can be understood that the above-mentioned support assembly 12, support plates 13 and side plates 50 are all made of insulating materials to prevent the electrode group 11 from short-circuiting and improve the safety of the battery cell group 10.
[0067] In some embodiments, the first explosion-proof structure 31 may only include a second explosion-proof valve, or may include a second explosion-proof valve and a second protective film, which can be adaptively selected with reference to the existing explosion-proof structure on the current battery cover 30, and no specific limitation is made here.
[0068] In some embodiments, at least one of the two battery covers 30 is structurally simplified, that is, only the cover body, the pole post protrusion on the cover body and the first explosion-proof structure 31 are retained, without other structures such as upper plastic and lower plastic. This not only simplifies the structure, but also reduces costs and improves space utilization.
[0069] Please refer to Figure 2 , in some embodiments, the single battery further includes an insulating film 70, and the insulating film 70 is wrapped around the outer periphery of the battery cell group 10 so that the battery cell group 10 and the housing 20 are insulated from each other.
[0070] Optionally, a slit 71 is provided in the insulating film 70 corresponding to the second explosion-proof structure 40 to make this part vulnerable, so that when the electrode group 11 undergoes thermal runaway, the slit 71 of the insulating film 70 can be broken through to discharge gas.
[0071] This embodiment also provides an energy storage device, which includes the single battery described in any of the above solutions. The energy storage device is a structure such as a battery module or a battery pack that loads the single battery and realizes power storage and external power supply. By adopting the above single battery, the energy storage device not only improves the capacity and energy density, but also improves the structural strength and safety to a certain extent.
[0072] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.
Claims
1. A single cell, characterized in that, Comprising: A battery cell group, including at least two pole groups sequentially connected in a first direction; A housing, having openings at both ends along the first direction, and the battery cell group can be placed in the housing along the openings; Two battery cover plates, corresponding to the openings one by one, the battery cover plates are hermetically connected to the openings, and the battery cover plates are provided with a first explosion-proof structure for exhausting gas and relieving pressure; At least two second explosion-proof structures, symmetrically arranged on both sides of the housing along a second direction and corresponding to the connection parts of two adjacent pole groups, the second direction is perpendicular to the first direction, and the second explosion-proof structure is used for exhausting gas and relieving pressure.
2. The single cell according to claim 1, characterized in that, At least one mounting hole is opened on both sides of the housing along the second direction, and each mounting hole is correspondingly provided with a second explosion-proof structure. The second explosion-proof structure includes a first explosion-proof valve and a first protective film. The first explosion-proof valve is hermetically connected to the mounting hole, and the first protective film is arranged on the side wall of the corresponding housing and covers the first explosion-proof valve.
3. The single cell according to claim 2, characterized in that, At least one mounting groove is opened on both sides of the housing along the second direction, the mounting hole is opened at the bottom of the mounting groove, and the first protective film is arranged in the mounting groove; the size of the mounting groove along the second direction is greater than the size of the first protective film along the second direction.
4. The single cell according to claim 1, characterized in that, Side plates are provided on both sides of the pole group along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other in pairs. A gap is provided between the circumferential side wall of the side plate and the circumferential side wall of the pole group to form an exhaust passage.
5. The single cell according to claim 4, characterized in that, The side plate includes a plurality of first plates and a plurality of second plates, the first plates and the second plates are alternately connected, and the size of the second plate along the second direction is smaller than the size of the first plate along the second direction, so that the second plate and the gas storage area of the exhaust passage are larger.
6. The single cell according to claim 1, characterized in that, A support assembly is provided between the two pole groups, and the support assembly is used for supporting the connection part of two adjacent pole groups.
7. The single cell according to claim 6, characterized in that, The support assembly includes two symmetrically arranged support members, the support members are provided with grooves, and the grooves of the two support members are buckled to form a support cavity, and the pole ear connection part of two adjacent pole groups is arranged in the support cavity.
8. The single cell according to claim 7, characterized in that, A communication cavity is opened on one side of the support member facing the second explosion-proof structure, and exhaust holes are arranged on both sides of the communication cavity along the third direction to communicate the gap between the battery cell group and the housing with the second explosion-proof structure. The first direction, the second direction, and the third direction are perpendicular to each other in pairs.
9. The single cell according to claim 8, characterized in that, A communication hole is opened on one side of the communication cavity away from the second explosion-proof structure to enable the communication cavities of the two support members to be communicated.
10. Energy storage device, characterized in that, Including the single battery according to any one of claims 1-9.