Battery cell

Abstract

The utility model discloses a battery monomer, and relates to the technical field of batteries, the battery monomer comprises a shell, a first cover plate assembly, a second cover plate assembly, a first inner core, a second inner core and a separation structure, the first cover plate assembly and the second cover plate assembly are respectively arranged at a first opening and a second opening of the shell, and the separation structure is arranged in the shell; the separation structure, the shell and the first cover plate assembly define a first containing space, the separation structure, the shell and the second cover plate assembly define a second containing space, and the first inner core and the second inner core are arranged in the first containing space and the second containing space respectively; according to the technical scheme provided by the embodiment of the invention, the interior of the battery monomer is divided into the two independent inner cores, so that the length of the single inner core is reduced, the current path is shortened, and the resistance is in direct proportion to the current path length, so that the internal resistance of the battery can be obviously reduced, the heating value of the battery is further reduced, and the energy efficiency is improved.

Description

battery cell Technical Field

[0001] The embodiments in this application relate to the field of battery technology, and in particular to a battery cell. Background Technology

[0002] Square batteries are a common type of lithium-ion battery packaging. Their casings typically employ a square structure, offering high space utilization and good mechanical stability. This compact battery structure, with its neatly arranged internal components, effectively utilizes the space within the battery pack, thereby increasing energy density. The cores of square batteries are generally classified into wound and stacked types based on their manufacturing process.

[0003] Taking a stacked battery as an example, its core is composed of multiple layers of positive electrode plates, negative electrode plates, and separators stacked alternately to form a compact electrode assembly, which is then encapsulated in a square casing. To increase the battery capacity, the core of the battery cell is designed to be longer. However, due to its structural characteristics, the current path away from the terminals is longer in a long cell, resulting in a higher internal resistance and a significant reduction in the energy efficiency of the battery cell. Summary of the Invention

[0004] Several embodiments in this application propose a battery cell with low internal resistance and high energy efficiency.

[0005] One embodiment of this application proposes a battery cell comprising:

[0006] case;

[0007] A first cover plate assembly is disposed at the first opening of the housing;

[0008] A second cover plate assembly is disposed at the second opening of the housing;

[0009] A partition structure is disposed within the housing; the partition structure, the housing, and the first cover plate assembly enclose a first accommodating space, and the partition structure, the housing, and the second cover plate assembly enclose a second accommodating space.

[0010] A first inner core is disposed within the first receiving space; and

[0011] The second inner core is disposed within the second accommodating space.

[0012] In one embodiment, the first opening and the second opening are arranged opposite to each other.

[0013] In one embodiment, the first cover plate assembly is provided with a first positive terminal post and a first negative terminal post, and the first inner core has a first positive terminal lug and a first negative terminal lug on the side facing away from the partition structure;

[0014] The first positive terminal is connected to the first positive tab, and the first negative terminal is connected to the first negative tab.

[0015] In one embodiment, the second cover plate assembly is provided with a second positive terminal and a second negative terminal, and the second inner core has a second positive terminal and a second negative terminal on the side opposite to the partition structure;

[0016] The second positive terminal is connected to the second positive tab, and the second negative terminal is connected to the second negative tab.

[0017] In one embodiment, the first cover assembly is provided with a first explosion-proof valve; and / or

[0018] The second cover plate assembly is equipped with a second explosion-proof valve.

[0019] In one embodiment, the first inner core has a first abutting surface facing the second inner core, and the second inner core has a second abutting surface facing the first inner core, the first abutting surface and the second abutting surface abutting against opposite sides of the partition structure.

[0020] In one embodiment, the partition structure is a partition plate, which is integrally formed with the housing.

[0021] In one embodiment, the thickness of the isolation plate is 1mm to 5mm.

[0022] In one embodiment, the isolation plate has a first groove and a second groove on opposite sides, with a portion of the structure of the first inner core accommodated in the first groove and a portion of the structure of the second inner core accommodated in the second groove.

[0023] In one embodiment, the distance between the first cover plate assembly and the second cover plate assembly is 500mm to 1200mm.

[0024] In several embodiments provided in this application, the internal structure of a single battery cell is divided into two separate inner cores. These two inner cores are led out through different terminals located at both ends of the casing. This reduces the length of each individual inner core, thereby shortening the current path. Since resistance is proportional to the current path length, the internal resistance of the battery can be significantly reduced. Specifically, the battery cell includes a casing, a first cover assembly, a second cover assembly, a first inner core, a second inner core, and a separating structure. The separating structure divides the interior of the casing into a first receiving space and a second receiving space. The first inner core is disposed in the first receiving space, and the second inner core is disposed in the second receiving space. The first inner core is led out through a first positive terminal and a first negative terminal, and the second inner core is led out through a second positive terminal and a second negative terminal. The two inner cores are isolated from each other and separated by the separating structure to prevent short circuits between them. The battery cell proposed in this solution can significantly reduce the internal resistance of the battery, thereby reducing heat generation and improving energy efficiency.

[0025] Moreover, the bipolar design allows the current to be distributed more evenly throughout the cell, reducing current concentration and thus improving charging and discharging efficiency. Attached Figure Description

[0026] 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.

[0027] Figure 1 is a schematic diagram of the structure of the first embodiment of the battery cell provided in this application;

[0028] Figure 2 is a schematic diagram of the explosion of a single battery cell in Figure 1;

[0029] Figure 3 is a cross-sectional view of the battery cell proposed in the first embodiment;

[0030] Figure 4 is a schematic diagram of the internal structure of the second embodiment of the battery cell provided in this application;

[0031] Figure 5 is a cross-sectional view of the battery cell in Figure 4 from another angle;

[0032] Figure 6 is a magnified view of part A in Figure 5.

[0033] Explanation of icon numbers:

[0034] 100. Battery cell; 1. Casing; 11. First cover assembly; 12. Second cover assembly; 13. First explosion-proof valve; 14. Second explosion-proof valve; 1a. First receiving space; 1b. Second receiving space; 1c. First opening; 1d. Second opening; 21. First positive terminal; 22. First negative terminal; 31. Second positive terminal; 32. Second negative terminal; 4. First inner core; 41. First positive electrode plate; 411. First positive electrode tab; 42. First negative electrode plate; 421. First negative electrode tab; 5. Second inner core; 51. Second positive electrode plate; 511. Second positive electrode tab; 52. Second negative electrode plate; 521. Second negative electrode tab; 6. Separator structure; 7. Separator. Detailed Implementation

[0035] 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.

[0036] It should be noted that if directional indications (such as up, down, left, right, front, back, etc.) are involved in multiple embodiments of this application, the directional indications 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 indications will also change accordingly.

[0037] 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.

[0038] Taking a stacked battery as an example, its core is composed of multiple layers of positive electrode plates, negative electrode plates, and separators stacked alternately to form a compact electrode assembly, which is then encapsulated in a square casing. To increase battery capacity, the core of each battery cell is designed to be longer. However, due to its structural characteristics, a longer cell has a longer current path away from the terminals, resulting in higher internal resistance. This increased internal resistance leads to more electrical energy being converted into heat and dissipated, reducing the battery's energy efficiency. Simultaneously, the longer current path also increases the voltage drop inside the battery, affecting its charge / discharge performance and power output, significantly reducing the energy efficiency of the battery cell. Furthermore, a longer cell may also lead to localized overheating and side reactions in terms of heat dissipation and the uniformity of electrochemical reactions, further reducing battery life and safety.

[0039] To address the aforementioned problems, this application proposes a battery cell to solve the technical issues mentioned above, as shown in Figures 1 to 6. The battery cell includes two independent inner cores, namely a first inner core 4 and a second inner core 5. The first inner core 4 and the second inner core 5 are led out through terminals located at opposite ends of the housing 1, and are separated by a partition structure 6.

[0040] Please refer to Figures 1 to 3. In the first embodiment of this application, the battery cell includes a housing 1, a first cover plate assembly 11, a second cover plate assembly 12, a first inner core 4, a second inner core 5, and a partition structure 6. The first cover plate assembly 11 is disposed at the first opening 1c of the housing 1, the second cover plate assembly 12 is disposed at the second opening 1d of the housing 1, and the partition structure 6 is disposed inside the housing 1. The partition structure 6, the housing 1, and the first cover plate assembly 11 enclose a first receiving space 1a, and the partition structure 6, the housing 1, and the second cover plate assembly 12 enclose a second receiving space 1b. The first inner core 4 is disposed in the first receiving space 1a, and the second inner core 5 is disposed in the second receiving space 1b.

[0041] It is understandable that, compared to a traditional single-core battery cell 100, the battery cell 100 in this application has two cores, namely a first core 4 and a second core 5. The first core 4 and the second core 5 are arranged along the length of the battery cell 100, thereby shortening the length of a single core. Specifically, please refer to Figure 2. To avoid short circuits caused by contact between one end of the first core 4 and the second core 5, the partition structure 6 divides the interior of the housing 1 into a first receiving space 1a and a second receiving space 1b. The first receiving space 1a is formed by the partition structure 6, the first core 4, the second core 5, and the second core 5. A cover plate assembly 11 and the inner wall of the housing 1 are enclosed to form a second receiving space 1b, which is formed by a partition structure 6, a second cover plate assembly 12 and the housing 1. A first inner core 4 is disposed in the first receiving space 1a and a second inner core 5 is disposed in the second receiving space 1b. To ensure the reliability of the isolation and the lightweight of the structure, the partition structure 6 is configured as an isolation plate integrally connected to the housing 1. The outer dimensions of the isolation plate are adapted to the cross-sectional dimensions of the first inner core 4 and the second inner core 5, thereby ensuring that no contact short circuit occurs in any structure of the first inner core 4 and the second inner core 5.

[0042] It should be noted that the dimensions of the first inner core 4 and the second inner core 5 along the length of the battery cell 100 may be inconsistent, that is, the first inner core 4 may be longer than the second inner core 5 or the second inner core 5 may be longer than the first inner core 4; or the lengths of the first inner core 4 and the second inner core 5 may be equal. This application does not impose any restrictions on this. In one embodiment of this application, the lengths of the first inner core 4 and the second inner core 5 are equal, thus ensuring a more uniform current distribution during charging and discharging. This design avoids the problem of uneven current density caused by inconsistent inner core lengths, thereby reducing the risk of local overheating and uneven electrochemical reactions. Inner cores of equal length can better balance the electric field distribution inside the battery, improve the overall performance and consistency of the battery, and extend the cycle life of the battery. In addition, this symmetrical design also helps to simplify the battery manufacturing process, reduce manufacturing costs, and improve production efficiency.

[0043] In several embodiments provided in this application, the internal structure of the battery cell 100 is divided into two separate inner cores of equal length. These two inner cores are led out through different terminals located at both ends of the casing 1. This reduces the length of each individual inner core, thereby shortening the current path. Since resistance is proportional to the current path length, the internal resistance of the battery can be significantly reduced. Specifically, the battery cell 100 includes a casing 1, a first inner core 4, a second inner core 5, and a separating structure 6. The first inner core 4 is led out through a first positive terminal 21 and a first negative terminal 22 at one end of the casing 1. The second inner core 5 is led out through a second positive terminal 31 and a second negative terminal 32 at the opposite end of the casing 1. The two inner cores are isolated from each other, and the separating structure 6 separates the first inner core 4 and the second inner core 5, preventing short circuits caused by contact. The battery cell 100 proposed in this scheme can significantly reduce the internal resistance of the battery, thereby reducing heat generation and improving energy efficiency. Moreover, the bipolar design allows the current to be distributed more evenly throughout the cell, reducing current concentration and thus improving charging and discharging efficiency.

[0044] It should be noted that the first inner core 4 and the second inner core 5 can abut against the two opposite sidewalls of the separator structure 6, or a certain gap can be left between the inner cores and the separator structure 6. This application does not impose any restrictions on this. In one embodiment of this application, the first inner core 4 and the second inner core 5 abut against the two large surfaces of the separator plate. Specifically, please refer to Figure 3. In this embodiment, the first inner core 4 and the second inner core 5 are designed to be of equal length and abut against the separator plate respectively. This ensures that the spatial layout of the two inner cores inside the battery is symmetrical and compact, avoiding the waste of internal space and structural imbalance caused by the difference in length. At the same time, the abutting design allows the separator structure 6 to tightly separate the two inner cores, enhancing the reliability of the separation and effectively preventing the risk of short circuits between the inner cores. The separator structure 6 also provides a certain support effect for the first inner core 4 and the second inner core 5. In addition, this compact structural layout helps to optimize the current distribution inside the battery, reduce the non-uniformity of the current path, and also improve the energy density per unit volume of the battery.

[0045] In one embodiment of this application, the separator can be installed into the housing 1 simultaneously with the inner core. Specifically, the first inner core 4 or the second inner core 5, already stacked, is first installed from one open end, followed by the separator and another inner core installed sequentially from the other open end. The separator's size is slightly smaller than the cross-sectional size of the housing 1, ensuring easy installation. This design makes the assembly process of the battery cell 100 more flexible and efficient. This step-by-step assembly method not only facilitates operation but also effectively avoids damage to the inner core and separator during assembly. The separator and housing 1 have independent structures, and their separate design further reduces the molding difficulty of the housing 1. Because there is a certain gap between the separator and the inner wall of the housing 1, the heat generated by the two inner cores can be easily channeled into a larger space, ensuring better heat dissipation performance. In this embodiment, a limiting structure can also be provided at the middle of the inner wall of the housing 1 to limit the separator, preventing it from shaking or shifting inside the housing 1, further improving the structural rationality.

[0046] Furthermore, the separator can be integrated with the housing 1, meaning the separator is part of the housing 1, and the two are formed through an integrated design. The separator divides the interior of the housing 1 into two completely isolated spaces, namely the first receiving space 1a and the second receiving space 1b. Specifically, please refer to Figure 2. This ensures that the first inner core 4 and the second inner core 5 are completely isolated physically and electrically, eliminating the risk of short circuits and greatly improving battery safety. Simultaneously, as the length of the battery cell 100 increases, the middle position of the housing 1 is susceptible to bending moments perpendicular to the housing 1, leading to deformation. The integrated design significantly enhances the structural strength of the housing 1, not only achieving electrical isolation between the first inner core 4 and the second inner core 5, but also serving as internal reinforcing ribs of the housing 1. This allows the battery cell 100 to exhibit better stability and resistance to deformation when facing external impacts or pressures, extending battery life, reducing safety hazards caused by structural damage, and providing strong assurance for the reliable operation of the battery cell 100.

[0047] It is understood that the separator structure 6 should be manufactured using an insulating material to ensure electrical isolation between the first inner core 4 and the second inner core 5. In one embodiment of this application, the separator structure 6 is preferably made of polycarbonate (PC). PC material has excellent electrical insulation properties, ensuring that short circuits do not occur between the inner cores. Simultaneously, its high strength and high-temperature resistance effectively support the inner core structure, preventing deformation caused by mechanical stress or thermal expansion. Furthermore, PC material has good chemical stability and is not easily corroded by electrolytes, thereby extending the service life of the separator and further enhancing the overall performance and reliability of the battery.

[0048] It should be noted that the separator thickness is greater than or equal to 1mm. This ensures sufficient insulation performance while saving internal space and increasing energy density per unit volume within the casing 1. A 1mm thick separator effectively reduces unused space within the casing 1, making the battery's internal structure more compact, thereby improving volume utilization and energy density per unit volume. Secondly, the 1mm thick separator provides good electrical isolation, ensuring no short circuits occur between the internal cells, thus improving battery safety.

[0049] To limit the positioning of the two inner cores, in one embodiment of this application, the separator plate is provided with a first groove and a second groove on opposite sides. The shape of the two grooves matches the cross-sectional shape of the inner cores, so that when the first inner core 4 and the second inner core 5 are assembled in the housing 1, the two ends of the first inner core 4 and the second inner core 5 facing the separator structure 6 can be accommodated in the first groove and the second groove, thereby limiting and fixing the inner cores, thus preventing the first inner core 4 and the second inner core 5 from shaking in the housing 1 and improving the structural stability of the battery cell 100.

[0050] In the first embodiment proposed in this application, both the first inner core 4 and the second inner core 5 adopt a stacked structure. The principle of the stacked cell is to alternately stack multiple layers of positive electrode sheets, negative electrode sheets, and separator 7 to form a compact electrode assembly. Lithium ions are inserted and extracted between the positive and negative electrode sheets through the separator 7, while electrons flow from the positive electrode to the negative electrode or from the negative electrode to the positive electrode through an external circuit, thereby realizing the charging and discharging of the battery. The stacked structure increases the electrode reaction area through the alternating stacking of multiple electrode sheets, improving the battery capacity and energy density, while optimizing the current distribution, reducing polarization, and improving the battery's charging and discharging efficiency and cycle life. The stacked inner core can be adapted to a square shell, thereby increasing the energy density per unit volume of the battery. In addition, the first inner core 4 and the second inner core 5 can also adopt a wound cell structure. The basic principle is to stack the separator, positive electrode sheet, separator, and negative electrode sheet in sequence, and then tightly wind them into a cylindrical or other shaped cell structure using a winding device. This application does not limit the specific structural type of the inner core.

[0051] To ensure timely pressure release when the internal pressure of the battery abnormally increases, the end cover of the battery is also equipped with an explosion-proof valve. The explosion-proof valve can be located on the first cover assembly 11, the second cover assembly 12, or both the first cover assembly 11 and the second cover assembly 12. This application does not limit this, and it should be adapted according to the internal structure of the housing 1 and the arrangement of the partition structure 6. Specifically, in one embodiment of this application, the first cover assembly 11 is equipped with a first explosion-proof valve 13, and the second cover assembly 12 is equipped with a second explosion-proof valve 14. When the first explosion-proof valve 13 is opened, the relatively closed first accommodating space 1a formed by the partition structure 6, the housing 1, and the first cover assembly 11 can communicate with the outside of the battery cell and release pressure; when the second explosion-proof valve 14 is opened, the relatively closed second accommodating space 1b formed by the partition structure 6, the housing 1, and the second cover assembly 12 can communicate with the outside of the battery cell and release pressure.

[0052] For example, when the partition structure 6 and the shell 1 are separate structures, that is, when the partition structure 6 is assembled, there is a gap between it and the inner wall of the shell 1, this gap can be used as an exhaust channel for the runaway gas from the inner core. A first explosion-proof valve 13 is provided on the first cover plate assembly 11, and a second explosion-proof valve 14 is provided on the second cover plate assembly 12, or an explosion-proof valve is provided on only one of the cover plates. When one of the inner cores goes out of control, the runaway gas can flow through the gap and be released from either explosion-proof valve, that is, either the first explosion-proof valve 13 or the second explosion-proof valve 14. In this embodiment, specifically, please refer to Figure 1, both explosion-proof valves exhaust gas simultaneously, so as to quickly release the runaway gas and keep the pressure change in a short period of time from being too large to cause the battery to explode. The explosion-proof valve is a pressure relief valve, which is obtained by thinning the first cover plate assembly 11 and the second cover plate assembly 12. When the inner core goes out of control and the internal pressure of the shell 1 suddenly increases, the structural strength of the pressure relief valve is significantly lower than that of the cover plate or other parts of the shell 1, and the runaway gas can easily break through and be released from here.

[0053] For example, when the partition structure 6 and the shell 1 are integrally formed, that is, the first accommodating space 1a and the second accommodating space 1b formed by the partition structure 6 are independent and unconnected spaces, in this case, both the first cover plate assembly 11 and the second cover plate assembly 12 need to be equipped with explosion-proof valves. That is, the first cover plate assembly 11 is equipped with a first explosion-proof valve 13 and the second cover plate assembly 12 is equipped with a second explosion-proof valve 14, so as to ensure that when any inner core experiences thermal runaway, the pressure can be released from the corresponding explosion-proof valve. In this embodiment, when a single inner core experiences thermal runaway, since the first accommodating space 1a and the second accommodating space 1b are not connected to each other, the other inner core will not be affected by the runaway inner core and the loss will be amplified.

[0054] Please refer to Figures 4 to 6. In the second embodiment of this application, the battery cell 100 includes a casing 1, a first inner core 4, a second inner core 5, and a separator 7. The first inner core 4 includes a first positive electrode 41 and a first negative electrode 42. The second inner core 5 includes a second positive electrode 51 and a second negative electrode 52. One end of the casing 1 is provided with a first positive electrode post 21 and a first negative electrode post 22, and the opposite end of the casing 1 is provided with a second positive electrode post 31 and a second negative electrode post 32. The first inner core 4 is formed by stacking multiple first electrode assemblies. Each first electrode assembly includes a first positive electrode 41 and a first negative electrode 42 spaced apart, and a separator 7 disposed between the first positive electrode 41 and the first negative electrode 42. The first positive electrode tab 411 of the first positive electrode 41 is connected to the first cover plate. The first positive electrode post 21 on component 11 is welded or connected via an adapter plate, and the first negative electrode tab 421 of the first negative electrode 42 is welded or connected via an adapter plate to the first negative electrode post 22 on the first cover plate assembly 11. Similarly, the second inner core 5 is composed of multiple second electrode assemblies stacked together. Each second electrode assembly includes a second positive electrode 51, a second negative electrode 52, and a separator 7 disposed between the second positive electrode 51 and the second negative electrode 52. The second positive electrode tab 511 of the second positive electrode 51 is welded or connected via an adapter plate to the second positive electrode post 31 on the second cover plate assembly 12, and the second negative electrode tab 521 of the second negative electrode 52 is welded or connected via an adapter plate to the second negative electrode post 32 on the second cover plate assembly 12.

[0055] In this embodiment, the first inner core 4 includes at least one inner core unit composed of a first positive electrode 41, a shared separator 7, and a first negative electrode 42, and the second inner core 5 includes at least one inner core unit composed of a second positive electrode 51, a shared separator 7, and a second negative electrode 52. Specifically, please refer to Figure 5. The use of the same separator 7 for the two inner cores can not only achieve the partitioning and isolation of the positive and negative electrode plates and avoid short circuits caused by contact between electrodes with opposite polarities of different inner cores, but also further simplify the lamination process.

[0056] In the above embodiments, the separator 7 has a continuous structure. The positive electrode (including the first positive electrode 41 and the second positive electrode 51), the separator 7, and the negative electrode (including the first negative electrode 42 and the second negative electrode 52) are stacked sequentially. The separator 7 serves to isolate the positive and negative electrodes and prevent short circuits, while allowing lithium ions to pass through to complete the electrochemical reaction. During the stacking process, the separator 7 can be folded in a Z-shape to alternately stack the positive and negative electrodes, forming a stable core structure. This arrangement not only ensures the ion conduction path inside the battery but also enhances the battery's safety through the microporous structure of the separator 7, such as limiting current and preventing thermal runaway in the event of overheating or overcharging. The separator 7, positive electrode, separator 7, and negative electrode, which are stacked sequentially, constitute the smallest energy storage unit, namely the aforementioned core unit. Two or more core units arranged in an array constitute the aforementioned first core 4 or second core 5.

[0057] In this embodiment, the same side of the separator 7 consists of electrodes with the same polarity, such as the first positive electrode 41 and the second positive electrode 51, or the first negative electrode 42 and the second negative electrode 52. Even if the two electrodes have the same polarity, they can still form a low-resistance conductive path through the ion conduction path in the electrolyte, causing current to flow directly between the two electrodes, thus forming a short circuit. To solve this problem, the distance between the first positive electrode 41 and the second positive electrode 51 is greater than or equal to 3 mm, and correspondingly, the distance between the first negative electrode 42 and the second negative electrode 52 is greater than or equal to 3 mm. Specifically, please refer to Figure 6. No isolation measures are taken between the first positive electrode 41 and the second positive electrode 51. By controlling the distance between the first positive electrode 41 and the second positive electrode 51 to more than 3 mm, it can be ensured that there will be no short circuit between electrodes of the same polarity, reducing local overheating, runaway chemical reaction and potential safety risks caused by short circuits. It also optimizes the internal space layout of the battery, ensuring that the battery maintains good structural stability and service life while operating efficiently.

[0058] In this embodiment, each first positive electrode 41 has a first positive electrode tab 411 on the side facing away from the second positive electrode 51, and each first negative electrode 42 has a first negative electrode tab 421 on the side facing away from the second negative electrode 52. The first positive electrode tab 411 and the first negative electrode tab 421 are staggered along the width direction of the electrode. The first positive electrode tab 411 is welded to the first positive electrode post 21 or connected through an adapter piece, and the first negative electrode tab 421 is welded to the first negative electrode post 22 or connected through an adapter piece. The electrodes are connected in a series of steps. Each second positive electrode 51 has a second positive tab 511 on the side facing away from the first positive electrode 41, and each second negative electrode 52 has a second negative tab 521 on the side facing away from the first negative electrode 42. The second positive tab 511 and the second negative tab 521 are staggered along the width direction of the electrode. The second positive tab 511 is welded to the second positive electrode post 31 or connected through an adapter piece, and the second negative tab 521 is welded to the second negative electrode post 32 or connected through an adapter piece. Specifically, please refer to Figure 4. All electrode plates connected to the first positive electrode post 21 and the first negative electrode post 22 are stacked to form the first inner core 4, and all electrode plates connected to the second positive electrode post 31 and the second negative electrode post 32 are stacked to form the second inner core 5. The two inner cores are led out from both ends of the housing 1.

[0059] In the second embodiment of this application, the first cover plate assembly 11 and / or the second cover plate assembly 12 are provided with pressure relief valves for use when thermal runaway occurs in the inner core. Since the interior of the housing 1 is interconnected, a pressure relief valve can be provided in either the first cover plate assembly 11 or the second cover plate assembly 12, or both cover plates can be provided with pressure relief valves. That is, a first explosion-proof valve 13 is provided on the first cover plate assembly 11, and a second explosion-proof valve 14 is provided on the second cover plate assembly 12. This application does not limit this.

[0060] 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. A battery cell, characterized in that, include: A housing (1); a first cover assembly (11) disposed at a first opening (1c) of the housing (1); a second cover assembly (12) disposed at a second opening (1d) of the housing (1); a partition structure (6) disposed within the housing (1); the partition structure (6), the housing (1), and the first cover assembly (11) enclose a first receiving space (1a), and the partition structure (6), the housing (1), and the second cover assembly (12) enclose a second receiving space (1b); a first inner core (4) disposed within the first receiving space (1a); and a second inner core (5) disposed within the second receiving space (1b).

2. The battery cell as described in claim 1, characterized in that, The first opening (1c) and the second opening (1d) are arranged opposite to each other.

3. The battery cell as described in claim 1, characterized in that, The first cover plate assembly (11) is provided with a first positive electrode post (21) and a first negative electrode post (22) through it. The first inner core (4) has a first positive electrode tab (411) and a first negative electrode tab (421) on the side facing away from the separation structure (6). The first positive electrode post (21) is connected to the first positive electrode tab (411), and the first negative electrode post (22) is connected to the first negative electrode tab (421).

4. The battery cell as described in claim 1, characterized in that, The second cover plate assembly (12) is provided with a second positive electrode post (31) and a second negative electrode post (32) through it. The second inner core (5) has a second positive electrode tab (511) and a second negative electrode tab (521) on the side facing away from the partition structure (6). The second positive electrode post (31) is connected to the second positive electrode tab (511), and the second negative electrode post (32) is connected to the second negative electrode tab (521).

5. The battery cell according to any one of claims 1 to 4, characterized in that, The first cover plate assembly (11) is provided with a first explosion-proof valve (13); and / or the second cover plate assembly (12) is provided with a second explosion-proof valve (14).

6. The battery cell according to any one of claims 1 to 4, characterized in that, The first inner core (4) has a first abutting surface facing the second inner core (5), and the second inner core (5) has a second abutting surface facing the first inner core (4). The first abutting surface and the second abutting surface abut against the opposite two sides of the partition structure (6).

7. The battery cell according to any one of claims 1 to 4, characterized in that, The partition structure (6) is a partition plate, which is integrally formed with the shell (1).

8. The battery cell as described in claim 7, characterized in that, The thickness of the isolation plate is 1mm to 5mm.

9. The battery cell as described in claim 7, characterized in that, The isolation plate has a first groove and a second groove on opposite sides. The first inner core (4) is partially accommodated in the first groove, and the second inner core (5) is partially accommodated in the second groove.

10. The battery cell according to any one of claims 1 to 4, characterized in that, The distance between the first cover plate assembly (11) and the second cover plate assembly (12) is 500mm to 1200mm.

Images