Binary star battery cell, battery pack and vehicle

Abstract

The utility model relates to a binary star battery cell, a battery pack and a vehicle. The binary star battery cell comprises: a housing having an accommodating space, a first end opening which is located at one end of the housing and is communicated with the accommodating space, and a second end opening which is located at the other end of the housing and is communicated with the accommodating space; the supporting piece is arranged in the middle of the shell so as to divide the containing space into a first containing cavity communicated with the first end opening and a second containing cavity communicated with the second end opening; the pole core assembly comprises a first pole core which is positioned in the first accommodating cavity and is connected to the supporting piece and a second pole core which is positioned in the second accommodating cavity and is connected to the supporting piece; and the pole cover assembly comprises a first pole cover which covers the first end opening and is electrically connected with the positive and negative poles of the first pole core, and a second pole cover which covers the second end opening and is electrically connected with the positive and negative poles of the second pole core.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a Gemini battery cell, a battery pack and a vehicle. Background Art

[0002] With the increasing maturity of lithium battery technology, as one of the key components of pure electric vehicles, power batteries are required to focus on breaking through the energy density, fast charging and safety performance of power batteries due to the gradually increasing requirements of users for the endurance and safety of electric vehicles. Existing batteries mainly consist of a cover plate, a housing, end plates, side plates, a bare battery cell insulating sheet and electrolyte. Among them, after the cover plate and the housing are welded, a sealed space that can protect the electrode group and has a certain mechanical strength is formed. After the side plates and the bare battery cell insulating sheet are welded and fixed, they are wrapped outside the electrode group. The bare battery cell insulating sheet is melt-fixed with the plastic part on the cover plate, so as to fix the electrode group in the housing and avoid short circuit of the electrode group. In addition, an explosion-proof valve is arranged on the cover plate to release pressure in time when the battery cell fails and discharge the gas in the housing to ensure the safe use of the battery.

[0003] In the common battery structure design, existing batteries usually include two types: one is a battery with electrode posts on the same side, such as VDA batteries, whose size ranges from 20 mm to 80 mm in thickness, 100 mm to 350 mm in width, and 90 mm to 140 mm in height; the other is a battery with electrode posts on different sides (both ends), such as blade batteries, whose size ranges from 13 mm to 24 mm in thickness, 300 mm to 600 mm in width, and 90 mm to 220 mm in height. However, both of the above two types of batteries have certain size limitations. For example, VDA batteries can only increase the energy density by increasing the height and thickness, and the battery cannot be made wider, that is, its width generally cannot exceed 350 mm; while blade batteries can increase the energy density by increasing the height and width, but the battery cannot be made thicker, that is, its thickness generally cannot exceed 24 mm.

[0004] In addition, the explosion-proof valves of the above two types of batteries are both designed on the cover plate of the battery and arranged adjacent to the battery electrode posts to spray gas into the end space of the battery for pressure relief when the battery cell fails. Since the internal electrode group of the battery is closely fitted with the housing, when the internal pressure of the battery is too high and needs to be rapidly depressurized through the explosion-proof valve, the discharge of gas will be affected by the small gap between the electrode group and the housing, resulting in low gas discharge efficiency. At the same time, high-temperature and high-pressure fluids such as electrolyte in the battery spray out, which is not only easy to spray onto the battery electrode posts, but also spreads heat to other batteries, further aggravating the thermal runaway of the battery and greatly increasing the safety risk of battery thermal runaway. Summary of the Utility Model

[0005] In view of the problems that the existing battery structure design not only fails to balance the customer's size requirements for battery thickness, width, and height while increasing the battery energy density, but also easily exacerbates the thermal runaway of the battery when relieving pressure through the explosion-proof valve, resulting in a significant increase in the safety risk of battery thermal runaway, the present application provides a Gemini battery cell, a battery pack, and a vehicle, which can be compatible with various size requirements while increasing the battery energy density, and can also improve the safety and reliability of the battery.

[0006] To achieve at least one of the above advantages or other advantages and purposes of the present utility model, the present utility model provides a Gemini battery cell, including:

[0007] A housing having an accommodation space, a first end opening located at one end of the housing and communicating with the accommodation space, and a second end opening located at the other end of the housing and communicating with the accommodation space;

[0008] A support member disposed in the middle of the housing to divide the accommodation space into a first accommodation cavity communicating with the first end opening and a second accommodation cavity communicating with the second end opening;

[0009] A pole core assembly including a first pole core located within the first accommodation cavity and connected to the support member, and a second pole core located within the second accommodation cavity and connected to the support member; and

[0010] A pole cover assembly including a first pole cover covering the first end opening and electrically connected to the positive and negative electrodes of the first pole core, and a second pole cover covering the second end opening and electrically connected to the positive and negative electrodes of the second pole core.

[0011] According to an embodiment of the present application, the support member is a hollow partition plate disposed between the first pole core and the second pole core, and the first accommodation cavity and the second accommodation cavity communicate through the hollow partition plate.

[0012] According to an embodiment of the present application, the housing is further provided with a pressure relief hole located at the bottom wall of the housing and communicating with the accommodation space.

[0013] According to an embodiment of the present application, the hollow partition plate is in clearance fit with the housing to reserve an exhaust passage communicating with the pressure relief hole between the hollow partition plate and the housing.

[0014] According to an embodiment of the present application, the pole core assembly includes a first pole core assembly and a second pole core assembly; the first pole core assembly includes two of the first pole cores stacked at intervals within the first accommodation cavity and a first insulating member stacked between the two first pole cores; the second pole core assembly includes two of the second pole cores stacked at intervals within the second accommodation cavity and a second insulating member stacked between the two second pole cores.

[0015] According to an embodiment of the present application, the first electrode core or the second electrode core includes an electrode core body, a positive electrode tab electrically connected to the positive electrode plate of the electrode core body, and a negative electrode tab electrically connected to the negative electrode plate of the electrode core body, and the positive electrode tab and the negative electrode tab protrude from the same end face of the electrode core body at intervals.

[0016] According to an embodiment of the present application, the first electrode cap or the second electrode cap includes a cover plate fixedly connected to the housing to seal the first end opening or the second end opening, a positive electrode post fixedly provided on the cover plate and fixedly connected to the positive electrode tab, and a negative electrode post fixedly provided on the cover plate and fixedly connected to the negative electrode tab.

[0017] According to an embodiment of the present application, the thickness of the Gemini battery cell is between 20 mm and 80 mm; the width of the Gemini battery cell is between 100 mm and 600 mm; the height of the Gemini battery cell is between 90 mm and 220 mm.

[0018] According to another aspect of the present application, the present application further provides a battery pack, including: the Gemini battery cell described in any one of the above.

[0019] According to another aspect of the present application, the present application further provides a vehicle, including: the above battery pack.

[0020] In summary, the Gemini battery cell of the present application can increase the size in the height, width, and thickness directions, so as to save the structural space of the battery cell and improve the energy density of the battery cell; specifically, the first electrode core and the second electrode core are arranged at intervals along the width direction (i.e., the left-right direction) of the Gemini battery cell, so that the width of the Gemini battery cell is increased; the positive and negative electrodes of the first electrode core and the second electrode core are both located in the width direction of the Gemini battery cell, so that the increase in the height of the Gemini battery cell is not restricted by the positive and negative electrode lead-out structures, which is beneficial to increasing the height of the Gemini battery cell; the number of the first electrode core and the second electrode core in each Gemini battery cell can be one or multiple, and multiple first electrode cores and multiple second electrode cores can be stacked along the thickness direction of the Gemini battery cell respectively, so as to increase the thickness of the Gemini battery cell.

[0021] In addition, when gas is generated inside the battery, the gas inside the housing can first flow rapidly through the relatively large gap reserved between the electrode core and the housing to the support member, and then be ejected directionally through the explosion-proof valve located at the pressure relief hole, greatly improving the gas discharge efficiency. At the same time, since the pressure relief hole provided with the explosion-proof valve is located at the bottom wall of the housing, that is, the explosion-proof valve is located at a part of the housing far from the pole cover assembly, the high-temperature and high-pressure gas ejected through the explosion-proof valve will be ejected towards the bottom space of the housing, will not be ejected onto the battery pole column, and will not spread heat to other batteries, which is beneficial to avoiding thermal runaway of the battery and greatly reducing the safety risk of battery thermal runaway. In particular, since the twin-star battery cell of the present application arranges the explosion-proof valve and the pole cover assembly (equipped with the battery pole column) at both ends and the bottom wall of the housing respectively, realizing their spatial separation, even if thermal runaway occurs in the battery cell, the ejecta will not cause the phenomenon of high-voltage arcing, making the battery have high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional schematic diagram of a twin-star battery cell according to an embodiment of the present invention;

[0023] Figure 2 shows an exploded schematic diagram of the twin-star battery cell according to the above embodiment of the present invention;

[0024] Figure 3 shows a longitudinal sectional schematic diagram of the twin-star battery cell according to the above embodiment of the present invention;

[0025] Figure 4 shows a transverse sectional schematic diagram of the twin-star battery cell according to the above embodiment of the present invention;

[0026] Figure 5 shows a schematic diagram of the structure of the twin-star battery cell according to the above embodiment of the present invention after removing the electrode core assembly and the pole cover assembly;

[0027] Figure 6 shows Figure 5 a three-dimensional sectional schematic diagram of the twin-star battery cell shown;

[0028] Figure 7 shows a schematic diagram of the state after the first electrode core and the first pole cover of the twin-star battery cell according to the above embodiment of the present invention are connected.

[0029] Description of Main Component Symbols: 1. Gemini battery cells; 10. Housing; 101. Accommodating space; 1011. First accommodation cavity; 1012. Second accommodation cavity; 102. First end opening; 103. Second end opening; 104. Pressure relief hole; 20. Support member; 21. Hollow partition; 211. Through hole; 212. Exhaust passage; 30. Electrode core assembly; 31. First electrode core; 311. Electrode core body; 312. Positive electrode tab; 313. Negative electrode tab; 32. Second electrode core; 33. First insulating member; 34. Second insulating member; 40. Electrode cover assembly; 41. First electrode cover; 410. Liquid injection hole; 411. Cover plate; 412. Positive electrode post; 413. Negative electrode post; 42. Second electrode cover; 50. Explosion-proof valve; 500. Explosion-proof sheet; 501. Central region; 502. Edge region.

[0030] The above description of the main component symbols further elaborates on the present utility model in conjunction with the accompanying drawings and specific embodiments. Specific Embodiments

[0031] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the following describes the specific embodiments of the present utility model in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0032] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In the present utility model, unless otherwise clearly defined or limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly defined. 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 circumstances.

[0035] In the present utility model, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0037] Considering that on the one hand, the existing battery structure design cannot take into account the customer's size requirements for the thickness, width and height of the battery while improving the battery energy density; on the other hand, the discharge of gas will be affected by the small gap between the electrode group and the housing, resulting in low gas discharge efficiency; at the same time, high-temperature and high-pressure fluids such as the electrolyte in the battery spray out, which not only easily sprays onto the battery terminal posts, but also spreads heat to other batteries, further exacerbating the thermal runaway of the battery and significantly increasing the safety risk of battery thermal runaway. To solve the above problems, the present application creatively provides a Gemini battery cell, a battery pack and a vehicle, which can be compatible with various size requirements while improving the battery energy density, and can also improve the safety and reliability of the battery.

[0038] Specifically, as Figures 1 to 7As shown, an embodiment of the present application provides a battery pack, which may include Gemini battery cells 1 for converting chemical energy into electrical energy, and can be applied to a vehicle as a power battery. It can be understood that the battery pack mentioned in the present application may also but is not limited to include other auxiliary components such as an outer package and a control board (such as a control circuit, a protection circuit, or an output circuit, etc.), which will not be elaborated in the present application. In addition, an electrolytic medium (not shown in the figure) is filled in the Gemini battery cell 1, and the electrolytic medium mentioned in the present application may be implemented as but is not limited to an electrolyte solution.

[0039] More specifically, as Figures 1 to 7 shown, the Gemini battery cell 1 may include a housing 10, a support member 20, an electrode core assembly 30, and an electrode cap assembly 40. The housing 10 has a receiving space 101, a first end opening 102 located at one end of the housing 10 and communicating with the receiving space 101, and a second end opening 103 located at the other end of the housing 10 and communicating with the receiving space 101. The support member 20 is disposed in the middle of the housing 10 to divide the receiving space 101 into a first receiving chamber 1011 communicating with the first end opening 102 and a second receiving chamber 1012 communicating with the second end opening 103. The electrode core assembly 30 includes a first electrode core 31 located within the first receiving chamber 1011 and connected to the support member 20, and a second electrode core 32 located within the second receiving chamber 1012 and connected to the support member 20. The electrode cap assembly 40 includes a first electrode cap 41 covering the first end opening 102 and electrically connected to the positive and negative electrodes of the first electrode core 31, and a second electrode cap 42 covering the second end opening 103 and electrically connected to the positive and negative electrodes of the second electrode core 32.

[0040] It should be noted that, as Figures 1 to 4As shown, since both the first electrode core 31 and the second electrode core 32 are located within the same housing 10 and are arranged on the left and right sides of the support member 20, the positive and negative electrodes of the first electrode core 31 and the second electrode core 32 are respectively led out from the first end opening 102 and the second end opening 103 of the housing 10. Therefore, the Gemini battery cell 1 can increase its size in the height, width, and thickness directions, so as to save the structural space of the battery cell and improve the energy density of the battery cell. In other words, the first electrode core 31 and the second electrode core 32 are arranged at intervals along the width direction (i.e., the left-right direction) of the Gemini battery cell 1, so that the width of the Gemini battery cell 1 is increased. The positive and negative electrodes of the first electrode core 31 and the second electrode core 32 are both located in the width direction of the Gemini battery cell 1, so that the increase in the height of the Gemini battery cell 1 is not restricted by the positive and negative electrode lead-out structure, which is beneficial to increasing the height of the Gemini battery cell 1. The number of the first electrode cores 31 and the second electrode cores 32 in each Gemini battery cell 1 can be one or multiple, and multiple first electrode cores 31 and multiple second electrode cores 32 can be stacked along the thickness direction of the Gemini battery cell 1 respectively, so as to increase the thickness of the Gemini battery cell 1.

[0041] Optionally, the housing 10 is further provided with a pressure relief hole 104 located on the bottom wall of the housing 10 and communicating with the accommodation space 101. Preferably, the pressure relief hole 104 is located in the middle of the bottom wall of the housing 10 and corresponds to the support member 20.

[0042] Optionally, the Gemini battery cell 1 further includes an explosion-proof valve 50, and the explosion-proof valve 50 is arranged at the pressure relief hole 104 of the housing 10.

[0043] In this way, as Figure 3 and Figure 4As shown, since the first pole core 31 and the second pole core 32 are both connected to the support member 20 without interference fit with the shell 10, a large gap can be reserved between the first pole core 31 and the second pole core 32 and the shell 10, respectively. Therefore, when gas is generated inside the battery, the gas inside the shell 10 can first quickly flow to the support member 20 through the large gap reserved between the pole core and the shell 10, and then be directed and ejected out through the explosion-proof valve 50, thereby greatly improving the gas discharge efficiency; at the same time, since the pressure relief hole 104 provided with the explosion-proof valve 50 is located on the bottom wall of the shell 10, that is, the explosion-proof valve 50 is located on the shell 10 away from the pole cover assembly 40, the high-temperature and high-pressure gas ejected through the explosion-proof valve 50 will be ejected toward the bottom space of the shell 10, and will not be ejected onto the battery pole, nor will the heat be diffused to other batteries, which is conducive to avoiding thermal runaway of the battery and greatly reducing the safety risk of thermal runaway of the battery. In particular, since the twin battery cell 1 of the present application arranges the explosion-proof valve 50 and the pole cover assembly 40 (with battery poles) at the two ends and the bottom wall of the shell 10 respectively, the two are separated in space. Therefore, even if the battery cell has thermal runaway, the eruption material will not cause high-voltage arcing, so that the battery has higher safety.

[0044] Alternatively, if Figures 2 to 4 As shown, the support member 20 is implemented as a hollow partition 21 disposed between the first pole core 31 and the second pole core 32, so as to insulate the electrons while supporting the first pole core 31 and the second pole core 32, and allow the electrolyte and gas to pass through. In other words, the hollow partition 21 of the present application can form a gap between the first pole core 31 and the second pole core 32 to play the role of insulating the electrons, and the electrolyte and the gas can flow smoothly, so that the electrolyte passes through the hollow partition 21 and fills the entire accommodating space 101, and at the same time, the internal gas generated when the battery cell is thermally runaway can quickly flow to the pressure relief hole 104 through the hollow partition 21, so as to be quickly discharged to the bottom of the shell 10 through the explosion-proof valve 50, thereby well overcoming the problem of insufficient reserved space for the battery, realizing rapid pressure relief protection for the battery, and having high safety.

[0045] Alternatively, if Figure 3 and Figure 6 As shown, the hollow partition plate 21 has a plurality of through holes 211 arranged in an array and connecting the first accommodation chamber 1011 and the second accommodation chamber 1012. In this way, the electrolyte and gas can pass through the hollow partition plate 21 through the through holes 211 to flow between the first accommodation chamber 1011 and the second accommodation chamber 1012.

[0046] It should be noted that the size of the hollow partition 21 mentioned in this application can be heated and designed according to the amount of gas generated by thermal runaway and the size of the explosion-proof valve, which can ensure that the gas effectively enters the position where the hollow partition 21 is located and can be discharged through the pressure relief hole 104.

[0047] Optionally, as Figure 4 and Figure 6 shown, the hollow partition 21 is in clearance fit with the housing 10 to reserve an exhaust passage 212 communicating with the pressure relief hole 104 between the hollow partition 21 and the housing 10. This can not only quickly guide the internal gas to the pressure relief hole 104 through the exhaust passage 212 for quick discharge through the explosion-proof valve 50, but also store a certain volume of electrolyte inside the housing 10 to ensure a long fast charging cycle life and help improve the cycle life of the battery. It can be understood that the existing application scenarios usually require a long fast charging cycle life for the battery, but the internal resistance of the battery will continuously increase during the cyclic use process, and the expansion force will also continuously increase, resulting in the electrolyte being extruded by the force, and the battery capacity will continuously decay; while the hollow partition 21 of this application can reserve a certain space inside the housing 10, which can play an insulating and protective role and can also ensure the liquid absorption and infiltration ability of the electrolyte during the battery cycle process, so as to improve the cycle service life of the battery.

[0048] Optionally, as Figures 4 to 6 shown, the explosion-proof valve 50 is implemented as an explosion-proof sheet 500 that blocks the pressure relief hole 104. The explosion-proof sheet 500 has a middle region 501 with a thickness less than the wall thickness of the housing (i.e., the wall thickness of the housing 10) and an edge region 502 with a thickness greater than the thickness of the middle region 501 and fixedly connected to the housing 10. In other words, the explosion-proof valve 50 has a thin sheet-like structure, and a weak region is provided in the middle of the explosion-proof valve 50. Once the internal pressure of the battery reaches a certain critical value, the high-pressure air flow will break through the weak region of the explosion-proof valve 50 to quickly and directionally relieve the pressure inside the housing.

[0049] It should be noted that the bottom wall thickness of the housing 10 is greater than or equal to the thickness of other walls of the housing 10 to enhance the strength of the bottom wall of the housing 10, facilitate the opening of the pressure relief hole 104, and provide strong support for the explosion-proof valve 50. In addition, the first electrode core 31 and the second electrode core 32 have the same structure, and the first electrode cover 41 and the second electrode cover 42 also have the same structure. For the sake of simplicity of description, this application takes the first electrode core 31 and the first electrode cover 41 as examples for detailed description.

[0050] According to the above embodiments of the present application, as Figure 3 and Figure 7As shown, the first electrode core 31 may include an electrode core body 311, a positive electrode tab 312 electrically connected to the positive electrode plate of the electrode core body 311, and a negative electrode tab 313 electrically connected to the negative electrode plate of the electrode core body 311. The positive electrode tab 312 and the negative electrode tab 313 are spaced apart and protrude from the same end face of the electrode core body 311 so as to be led out from the same end opening (i.e., the first end opening 102) of the housing 10 and electrically connected to the positive and negative electrodes of the same electrode cap. It can be understood that the electrode core body 311 may be formed by alternately stacking or winding a plurality of positive electrode plates and a plurality of negative electrode plates, and a separator is provided between two adjacent electrode plates; in addition, the positive electrode tab 312 of the present application may be integrally connected to the positive electrode plate of the electrode core body 311, and the negative electrode tab 313 of the present application may be integrally connected to the negative electrode plate of the electrode core body 311.

[0051] Correspondingly, as Figure 3 and Figure 7 shown, the first electrode cap 41 may include a cover plate 411 fixedly connected to the housing 10 to seal the first end opening 102, a positive electrode post 412 fixed to the cover plate 411 and fixedly connected to the positive electrode tab 312, and a negative electrode post 413 fixed to the cover plate 411 and fixedly connected to the negative electrode tab 313. It can be understood that the fixed connection mentioned in the present application may be implemented but not limited to laser welding.

[0052] It should be noted that, in order to increase the thickness of the battery cell, the number of the first electrode core 31 and the second electrode core 32 in the Gemini battery cell 1 of the present application may both be implemented as two or more, and two or more first electrode cores 31 or second electrode cores 32 are stacked at intervals, and an insulating member is provided between two adjacent first electrode cores 31 or between two adjacent second electrode cores 32.

[0053] Exemplarily, as Figure 2 and Figure 7 shown, the electrode core assembly 30 may include a first electrode core assembly and a second electrode core assembly; the first electrode core assembly includes two first electrode cores 31 stacked at intervals within the first accommodation cavity 1011 and a first insulating member 33 stacked between the two first electrode cores 31; the second electrode core assembly includes two second electrode cores 32 stacked at intervals within the second accommodation cavity 1012 and a second insulating member 34 stacked between the two second electrode cores 32. It can be understood that the first insulating member 33 and the second insulating member 34 mentioned in the present application may be implemented but not limited to insulating plates or insulating films.

[0054] Optionally, the positive tabs 312 of the two first electrode cores 31 are bent and welded simultaneously to the positive terminal post 412 of the first pole cover 41, and the negative tabs 313 of the two first electrode cores 31 are bent and welded simultaneously to the negative terminal post 413 of the first pole cover 41; similarly, the positive tabs of the two second electrode cores 32 are bent and welded simultaneously to the positive terminal post of the second pole cover, and the negative tabs of the two second electrode cores 32 are bent and welded simultaneously to the negative terminal post of the second pole cover.

[0055] Optionally, as Figure 3 and Figure 7 shown, the first pole cover 41 has a liquid injection hole 410 opened on the cover plate 411, so that after the battery manufacturing and assembly are completed and before the battery is charged and discharged, electrolytic media such as electrolyte can be introduced into the interior of the housing through the liquid injection hole 410 to complete the sufficient wetting of the electrode core and the electrolyte. It can be understood that the cover plate of the second pole cover 42 of the present application may not have a liquid injection hole, and the electrolyte can be injected into the first accommodation cavity 1011 and the second accommodation cavity 1012 only through the liquid injection hole 410 on the first pole cover 41 to sufficiently wet the first electrode core 31 and the second electrode core 32.

[0056] For example, the thickness of the Gemini battery cell 1 can be between 20 mm and 80 mm; the width of the Gemini battery cell 1 can be between 100 mm and 600 mm; the height of the Gemini battery cell 1 can be between 90 mm and 220 mm. In this way, the size of the Gemini battery cell 1 can be compatible with various battery sizes, has good compatibility, is easy to modularize and standardize. When the battery cells are assembled into a battery pack, multiple Gemini battery cells 1 can be connected in series or in parallel, and the CTP (Cell to Pack) technology can be used to directly assemble the batteries into a battery pack (Pack), or the CTB (Cell to Body) technology can be used to integrate the batteries with the vehicle body to ensure the high integration of the batteries.

[0057] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0058] The above embodiments only represent several implementation manners of the present utility model, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. Gemini battery cell, characterized in that: include: A shell having a storage space, a first end opening located at one end of the shell and communicating with the storage space, and a second end opening located at the other end of the shell and communicating with the storage space; A support member is disposed in the middle of the housing to separate the accommodation space into a first accommodation cavity communicating with the first end opening and a second accommodation cavity communicating with the second end opening; A pole core assembly, comprising a first pole core located in the first accommodating cavity and connected to the support member, and a second pole core located in the second accommodating cavity and connected to the support member; as well as The pole cap assembly includes a first pole cap covering the first end opening and electrically connected to the positive and negative poles of the first pole core, and a second pole cap covering the second end opening and electrically connected to the positive and negative poles of the second pole core.

2. The Gemini battery cell according to claim 1, characterized in that: The support member is a hollow partition plate disposed between the first pole core and the second pole core, and the first accommodating cavity and the second accommodating cavity are connected through the hollow partition plate.

3. The Gemini battery cell according to claim 2, characterized in that: The shell is also provided with a pressure relief hole located on the bottom wall of the shell and communicated with the accommodating space.

4. The Gemini battery cell according to claim 3, characterized in that: The hollow partition plate is gap-matched with the shell, so as to reserve an exhaust passage connected with the pressure relief hole between the hollow partition plate and the shell.

5. The Gemini battery cell according to any one of claims 1 to 4, characterized in that: The pole core assembly includes a first pole core assembly and a second pole core assembly; the first pole core assembly includes two first pole cores stacked and spaced apart in the first accommodating cavity and a first insulating member stacked between the two first pole cores; The second pole core assembly includes two second pole cores stacked and spaced apart in the second accommodating cavity and a second insulating member stacked between the two second pole cores.

6. The Gemini battery cell according to any one of claims 1 to 4, characterized in that: The first pole core or the second pole core includes a pole core body, a positive pole ear electrically connected to the positive pole sheet of the pole core body, and a negative pole ear electrically connected to the negative pole sheet of the pole core body, and the positive pole ear and the negative pole ear are protruded from the same end surface of the pole core body at intervals.

7. The Gemini battery cell according to claim 6, characterized in that: The first pole cover or the second pole cover includes a cover plate fixedly connected to the shell to seal the first end opening or the second end opening, a positive pole column fixedly arranged on the cover plate and fixedly connected to the positive pole ear, and a negative pole column fixedly arranged on the cover plate and fixedly connected to the negative pole ear.

8. The Gemini battery cell according to any one of claims 1 to 4, characterized in that: The thickness of the Gemini battery cell is between 20 mm and 80 mm; the width of the Gemini battery cell is between 100 mm and 600 mm; and the height of the Gemini battery cell is between 90 mm and 220 mm.

9. A battery pack, characterized in that: include: A Gemini battery cell as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that include: The battery pack as claimed in claim 9.

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