A battery

Abstract

The application provides a battery, comprising: a shell assembly, an accommodation space is formed inside; a bare battery core is arranged in the accommodation space; the bare battery core comprises at least two pole pieces and a diaphragm for isolating adjacent two pole pieces; the pole piece comprises a pole piece main body, the pole piece main body comprises a first main body edge and a second main body edge which are arranged at intervals along a first direction, and the diaphragm exceeds the first main body edge and the second main body edge along the first direction; the pole piece main body comprises a functional area arranged between the first main body edge and the second main body edge, the functional area has a first functional edge close to the first main body edge and a second functional edge close to the second main body edge; and the shell assembly at least extrudes the diaphragm exceeding the edge. Through the above design, the bare battery core can have necessary thermal expansion and buffer space after assembly, and can also maintain stable positioning effect.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a battery. Background Technology

[0002] With the continuous improvement of energy density of energy storage systems and the significant increase in the capacity of individual cells, the overall size of energy storage batteries is showing a continuous increasing trend, and the single-cell capacity of large-capacity energy storage cells has approached 500Ah or even higher.

[0003] In practical applications, large-capacity energy storage batteries often exhibit structural failures during safety tests involving vibration, shock, and thermal abuse. Improving the structural reliability and safety of batteries has become a pressing technical challenge. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery that solves or partially solves the above-mentioned problems.

[0005] For the purposes described above, this application provides a battery, comprising: The outer casing assembly has an internal accommodating space. A bare battery cell is disposed within the receiving space; the bare battery cell includes at least two electrodes and a separator that isolates at least two adjacent electrodes; each electrode includes an electrode body, the electrode body including a first body edge and a second body edge spaced apart along a first direction, the separator extending beyond the first body edge and the second body edge along the first direction; the electrode body includes a functional region disposed between the first body edge and the second body edge, an active material layer being formed in the functional region, the functional region having a first functional edge near the first body edge and a second functional edge near the second body edge; The housing assembly at least compresses the portion of the diaphragm that extends beyond the first body edge and the portion that extends beyond the second body edge; along the first direction, the minimum straight-line distance between the first functional edge and the housing assembly is a, and the minimum straight-line distance between the second functional edge and the housing assembly is b, 0.4mm≤a+b≤1.0mm.

[0006] Optionally, the electrode includes a positive electrode and a negative electrode. The positive electrode includes a tab connected to the edge of the first body. The electrode body of the positive electrode includes an insulating region extending from the first functional edge to the edge of the first body, and an insulating material layer is formed in the insulating region. Along the first direction, the first body edge of the positive electrode extends beyond the first functional edge of the negative electrode, and the straight-line interval between the two is H1, where H1 is 0.3 mm to 1.5 mm.

[0007] Optionally, the electrode includes a positive electrode and a negative electrode. The negative electrode includes a tab connected to the edge of the first body or the edge of the second body. The electrode body of the negative electrode includes an insulating region disposed between the functional area and the tab, and an insulating material layer is formed in the insulating region.

[0008] Optionally, along the first direction, the edge of the separator extends beyond the first body edge of the positive electrode sheet, and the straight-line interval between the two is H2, where H2 is 1.5 mm to 4 mm.

[0009] Optionally, along the first direction, the edge of the separator extends beyond the second body edge of the negative electrode sheet, and the straight-line interval between the two is H3, where H3 is 1.5 mm to 4 mm.

[0010] Optionally, the diaphragm is provided with a c layer along the second direction, and the thickness of the diaphragm is d, the second direction is perpendicular to the first direction, and the product of c and d is 0.8 mm to 1.5 mm.

[0011] Optionally, the housing assembly includes a housing and a cover assembly. At least one end of the housing along the first direction is an open end with an opening. The cover assembly includes a cover plate and an insulating member. The cover plate is closed and connected to the open end and surrounds the housing to form the receiving space. The insulating member is disposed on the side of the cover plate facing the bare battery cell, and the insulating member has a protruding structure protruding towards the bare battery cell. The bare cell includes a main body formed by the positive electrode, the negative electrode and the separator. The main body includes a first end and a second end disposed opposite to each other along the first direction. The protruding structure presses against a first region of the first end. The battery also includes an insulating layer disposed between the bare cell and the cover plate assembly and connected to the first end. The insulating layer covers at least a portion of the first region.

[0012] Optionally, one end of the housing along the first direction is the open end, and the other end is the closed end; the housing assembly includes a support member disposed between the closed end and the bare cell, the support member pressing against the second end.

[0013] Optionally, the main body is a wound structure or a stacked structure.

[0014] Optionally, both ends of the housing along the first direction are open ends, and the battery includes two cover plate assemblies that correspond one-to-one with the two open ends. One of the two cover plate assemblies presses against the first end, and the other presses against the second end.

[0015] As can be seen from the above, the battery provided in this application, by having the casing assembly at least compress the portion of the separator extending beyond the first body edge and the portion extending beyond the second body edge, forms a stable limiting and supporting buffer between the casing assembly and the bare cell. Simultaneously, because the separator is elastic, the compressive force applied by the casing assembly to the bare cell can be dispersed by the separator, preventing external forces from directly acting on the electrode sheets and significantly reducing the risk of edge stress concentration on the electrode sheets. Furthermore, by limiting the total dimensions of a and b along the first direction to 0.4 mm to 1.0 mm, the bare cell, after assembly, possesses both the necessary thermal expansion and buffer space, and maintains a stable positioning effect.

[0016] It should also be noted that the above structure can achieve integrated stress optimization of bare cells and casing components without adding extra parts or complex processes, thereby improving the vibration resistance and fatigue life of the battery and ensuring the structural stability and safety reliability of large-capacity energy storage cells under long-term operation and thermal stress environment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the 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 these drawings without creative effort.

[0018] Figure 1 This is a partial cross-sectional view of the battery in an embodiment of this application. Figure 2 The battery of the second structure in the embodiments of this application is in Figure 1 Partial cross-sectional diagram of section AA; Figure 3 This is a cross-sectional schematic diagram of the bare cell of the battery with the second structure according to an embodiment of this application, in its unassembled state; Figure 4 This is a schematic diagram of the layer structure of the bare battery cell according to an embodiment of this application; Figure 5 This is a schematic diagram of another battery structure according to an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 1000, Housing assembly; 100, Housing; 110, Open end; 120, Receiving space; 130, Support; 140, Closed end; 300, Cover assembly; 310, Insulator; 311, Protruding structure; 320, Cover; 2000, Bare cell; 2100, Main body; 2110, First end; 2111, First region; 2120, Second end; 2200, Insulating layer; 200, Electrode; 210, Electrode body; 211, First body edge; 212, Second body edge; 220, Functional area; 221, First functional edge; 222, Second functional edge; 230, Positive electrode; 240, Negative electrode; 250, Separator; 260, Insulating area; 400, Tab. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Figure 1 This shows a partial cross-sectional view of the battery from a first perspective; In some embodiments, the first battery includes: a housing assembly 1000 having an internal receiving space 120; a bare cell 2000 disposed within the receiving space 120; the bare cell 2000 includes at least two electrodes 200 (e.g., a positive electrode 230 and a negative electrode 240), and a separator 250 separating at least two adjacent electrodes 200. To prevent the housing assembly 1000 from excessively compressing the bare cell 2000 and to avoid damage to the electrodes 200 in the bare cell 2000 due to pressure, the bare cell 2000 is positioned along a first direction (e.g., ...). Figure 1 The two ends of the X-direction shown are spaced apart from their respective adjacent housing assemblies 1000 to form a gap.

[0023] In the above embodiments, the battery can be a large-capacity battery. When subjected to safety tests such as vibration, impact, and thermal runaway, it often exhibits a series of structural failures. For example, in vibration tests, the battery casing 1000 is prone to fatigue cracking along the first direction; under thermal runaway conditions, the structural strength of the casing 1000 is insufficient, failing to effectively constrain the deformation or expansion of the internal cells, resulting in safety performance not meeting design requirements. Therefore, the gap design between the battery casing and the internal bare cells 2000 becomes a crucial factor affecting the overall structural reliability of the battery.

[0024] However, the applicant has found that if the gap is too large, when the battery is subjected to impact and vibration, the bare cell 2000 shakes and impacts within the housing space 120, which can easily cause problems such as the active material on the electrode 200 detaching (or shedding powder) and the edge of the electrode 200 peeling off; if the gap is too small, excessive compressive stress will be generated when the battery is thermally expanded or the casing is deformed, resulting in local instability of the casing 100 or the bare cell 2000.

[0025] To address the aforementioned issues, this application proposes a battery with an alternative structure. By adjusting the layout and dimensions of the bare cell 2000 and thereby controlling the gap, the above problems can be solved or partially solved.

[0026] Figure 2 The second type of battery structure was demonstrated. Figure 1 A partial cross-sectional view of section AA; a cross-sectional view of the battery with the second structure; Figure 3 A cross-sectional view of the bare cells of the second type of battery, in their unassembled state, is shown. Figure 4 Showing Figure 3 A schematic diagram of the layer structure of the bare battery cell in the diagram; Figure 5 This diagram illustrates another battery structure. Figure 2 and Figure 3 All Figure 1 A cross-sectional view along section line AA.

[0027] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, a battery is provided, comprising: The outer casing assembly 1000 has an internal accommodating space 120; A bare battery cell 2000 is disposed within a receiving space 120. The bare battery cell 2000 includes at least two electrode sheets 200 and a separator 250 that isolates at least two adjacent electrode sheets 200. Each electrode sheet 200 includes an electrode body 210, which includes a first body edge 211 and a second body edge 212 spaced apart along a first direction. The separator 250 extends beyond the first body edge 211 and the second body edge 212 along the first direction. The electrode body 210 includes a functional region 220 disposed between the first body edge 211 and the second body edge 212. An active material layer is formed in the functional region 220. The functional region 220 has a first functional edge 221 near the first body edge 211 and a second functional edge 222 near the second body edge 212. The housing assembly 1000 (or housing) at least compresses the portion of the diaphragm 250 that extends beyond the first body edge 211 and the portion that extends beyond the second body edge 212; along the first direction, the minimum straight-line distance between the first functional edge 221 and the housing assembly 1000 is a, and the minimum straight-line distance between the second functional edge 222 and the housing assembly 1000 is b, 0.4mm≤a+b≤1.0mm.

[0028] For example, the housing assembly 1000 may include a metal housing 100 and a cover assembly 300, which together form a receiving space 120. At least one end of the metal housing 100 has an opening, with a first direction being the direction through which the bare battery cell 2000 is inserted into the housing 100. Specifically, as... Figure 1 As shown, if the housing assembly 1000 includes a cover assembly 300, the first direction is the height direction of the battery (e.g., Figure 1 (in the X direction). For example... Figure 5 As shown, if the housing assembly 1000 includes two cover assemblies 300 arranged opposite to each other, the first direction is the length direction of the battery, that is, the direction from one cover assembly 300 to the other cover assembly 300 (e.g., Figure 5 (in the X direction).

[0029] Optionally, the second body edge 212 and the second functional edge 222 may overlap.

[0030] It should also be noted that, for the convenience of describing the following embodiments, unless otherwise specified, the following embodiments will all be described using a prismatic battery as an example.

[0031] For example, the dimensions of the receiving space 120 are highly matched with the outer contour of the bare cell 2000, ensuring that the bare cell 2000 can form a stable supporting contact relationship within the housing 100 after assembly. Optionally, the inner wall of the receiving space 120 of the housing assembly 1000 can be designed as a plane or have a micro-flange structure to limit and fix the edge of the bare cell 2000, thereby preventing displacement or shaking of the cell during transportation, installation and operation.

[0032] The bare cell 2000 is disposed entirely within the receiving space 120, and is mainly composed of at least two electrode plates 200 (e.g., positive electrode plate 230 and negative electrode plate 240) and a separator 250 sandwiched between them. Each electrode plate 200 includes an electrode plate body 210, and the electrode plate body 210 has a first body edge 211 and a second body edge 212 formed at both ends along the first direction.

[0033] Additionally, an active material layer is deposited in the functional region 220 of the electrode body 210. Optionally, a non-functional region 220 may also be provided in the electrode body 210 near the first body edge 211 and / or the second body edge 212. The non-functional region 220 may be provided with materials other than the active material. Along the first direction, the separator 250 extends relative to the electrode body 210 by a certain distance on both sides of the electrode 200. This extended portion can provide electrical insulation redundancy and also serve as a flexible buffer interface in subsequent assembly.

[0034] When the housing assembly 1000 contacts the bare cell 2000, the housing assembly 1000 locally compresses the portion of the separator 250 extending beyond the electrode body 210, thereby limiting and fixing the bare cell 2000 without directly acting on the electrode body 210. Specifically, during assembly, the inner wall of the receiving space 120 within the housing assembly 1000 forms surface or line contact with the portion of the separator 250 extending beyond the first body edge 211 and / or the second body edge 212, thereby constraining and limiting both ends of the bare cell 2000 without interfering with the functional area 220 of the electrode 200. Furthermore, since the separator 250 extending from the edge has a certain degree of elasticity, it can absorb minor deformations during assembly and vibration. Consequently, when the contact area between the functional area 220 and the housing assembly 1000 is subjected to compressive force, the compressive force can be evenly distributed through the flexible buffer interface of the separator 250, avoiding or reducing stress concentration transmission to the electrode 200.

[0035] This embodiment will be explained by analyzing the relationship between the minimum straight-line distance a between the first functional edge 221 and the housing assembly 1000 along the first direction and the minimum straight-line distance b between the second functional edge 222 and the housing assembly 1000.

[0036] Optionally, a+b can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1.0mm.

[0037] by Figure 2 Taking the structure and orientation shown as an example, it can be understood that a is the distance between the functional area 220 of the electrode 200 and the housing assembly 1000 at the right end of the bare cell 2000; b is the distance between the functional area 220 of the electrode 200 and the housing assembly 1000 at the right end of the bare cell 2000; and the sum of a and b is the sum of the distances between the left and right ends of the bare cell 2000 and the housing assembly 1000.

[0038] When a+b is too large, the bare cell 2000 is prone to shaking or micro-wear within the housing space 120 of the casing 100. Specifically, for new batteries, since the battery has not yet undergone sufficient charge-discharge cycles, there may still be a gap between the bare cell 2000 and the casing 100. This gap may cause relative movement between the bare cell 2000 and the casing 100 due to vibrations generated during battery transportation, resulting in the bare cell 2000 impacting the casing 100 and causing failures such as cracking at the sealing point of the casing 100. When a+b is too small, the outer casing assembly 1000 may directly compress the functional area 220, causing the edge of the electrode 200 to be damaged by excessive pressure, resulting in material loss from the edge of the electrode 200, thus affecting battery safety. Therefore, by controlling a+b between 0.4mm and 1.0mm, the bare cell 2000 can obtain stable support while maintaining sufficient isolation space.

[0039] In this embodiment, the battery uses the casing assembly 1000 to compress at least the portion of the separator 250 extending beyond the first body edge 211 and the portion extending beyond the second body edge 212, thereby creating a stable limiting and supporting buffer between the casing assembly 1000 and the bare cell 2000. At the same time, since the separator 250 is elastic, the force passing through the casing assembly 1000 can be dispersed by the separator 250, preventing external forces from acting directly on the electrode 200 and significantly reducing the risk of edge stress concentration. In addition, by limiting the total dimensions of a and b along the first direction to 0.4 mm to 1.0 mm, the bare cell 2000 has the necessary thermal expansion and buffer space after assembly, and can also maintain a stable positioning effect.

[0040] It should also be noted that the above structure can achieve integrated stress distribution between the bare cell 2000 and the casing assembly 1000 without adding extra parts or complex processes, thereby improving the battery's vibration resistance and fatigue life, and ensuring the structural stability and safety of the large-capacity energy storage cell under long-term operation and thermal stress environment.

[0041] In some embodiments, such as Figure 3 and Figure 4 As shown, the electrode 200 includes a positive electrode 230 and a negative electrode 240. The positive electrode 230 includes a tab 400 connected to the first body edge 211. The electrode body 210 of the positive electrode 230 includes an insulating region 260 extending from the first functional edge 221 to the first body edge 211, and an insulating material layer is formed in the insulating region 260. Along the first direction, the first body edge 211 of the positive electrode 230 extends beyond the first functional edge 221 of the negative electrode 240, and the straight-line interval between the two is H1, where H1 is 0.3 mm to 1.5 mm.

[0042] Specifically, the positive electrode 230 has a tab 400 along the first body edge 211 for current extraction or connection with an external adapter plate; an insulating region 260 is provided between the functional area 220 of the positive electrode 230 and the tab 400, and an insulating material layer is formed in this region.

[0043] Furthermore, when the bare cell 2000 is pressed against the lower edge of the cover plate assembly 300 (i.e., the side of the cover plate assembly 300 close to the bare cell 2000 along the first direction), in addition to the buffering provided by the diaphragm 250, the insulating region 260 can be used as a transition. Specifically, the insulating region 260 is used as a buffer space, which not only ensures that the functional areas 220 of the positive and negative electrodes maintain a safe distance during assembly, but also allows the small deformations generated during extrusion or vibration to be absorbed by the insulating region 260. This helps to prevent the functional area 220 from being compressed during vibration, impact or thermal expansion, thereby reducing the risk of active layer peeling or wear.

[0044] Alternatively, the insulating region 260 may be made of ceramic material.

[0045] For example, H1 can be 0.3mm, 0.6mm, 0.9mm, 1.2mm or 1.5mm.

[0046] If H1 is too small, the distance between the first main body edge 211 of the positive electrode 230 and the first functional edge 221 of the negative electrode 240 will be too small, and the functional area 220 may come into contact with the tab 400 during assembly or vibration, increasing the risk of short circuit or local overcurrent. If H1 is too large, the distance between the first main body edge 211 of the positive electrode 230 and the first functional edge 221 of the negative electrode 240 will be too large, and the separator 250 may have difficulty effectively clamping the electrode 200, resulting in increased shaking of the bare cell 2000 within the housing 100, while weakening the overall force-bearing effect and reducing vibration and shock protection capabilities.

[0047] Therefore, H1 needs to be controlled within a reasonable range of 0.3mm to 1.5mm to balance electrical safety and mechanical stability. Along the first direction, by further extending the distance between the edge of the insulation region 260 and the edge of the negative electrode 200, when the cover assembly 300 presses against the bare cell 2000, in addition to utilizing the buffer of the diaphragm 250, the insulation region 260 can be used for transition, preventing excessive pressure from damaging the edge of the negative electrode 200 and causing it to fall off. It should also be noted that if the edge of the insulation region 260 extends too far beyond the negative electrode 200, it will lead to a decrease in the overall energy density of the product; therefore, it needs to be controlled within a suitable range.

[0048] This embodiment achieves a safe separation between the functional area 220 of the positive electrode 230 and the tab 400 through the above structure, ensuring the reliability of the current lead-out path and protecting the functional area 220 from mechanical stress and local short circuits. At the same time, the appropriate interval H1 can also provide mechanical buffer and assembly margin for the bare cell 2000, enabling the cell to have higher structural stability and operational safety under long-term use and complex operating conditions.

[0049] In some embodiments, such as Figure 3 and Figure 4 As shown, the electrode 200 includes a positive electrode 230 and a negative electrode 240. The negative electrode 240 includes a tab 400 connected to the first body edge 211 or the second body edge 212. The electrode body 210 of the negative electrode 240 includes an insulating region 260 disposed between the functional region 220 and the tab 400, and an insulating material layer is formed in the insulating region 260.

[0050] It should be noted that, if it is as follows Figure 1 In the case of the battery shown, the tab 400 of the negative electrode 240 is connected to the edge 211 of the first body; if it is as shown... Figure 5 In the case of the battery shown, the tab 400 of the negative electrode 240 is connected to the edge 212 of the second body.

[0051] For example, the insulating material in the insulating region 260 on the negative electrode 240 may be the same as or different from the insulating material in the insulating region 260 on the positive electrode 230.

[0052] The function of the insulating region 260 on the negative electrode plate 240 is similar to that of the insulating region 260 on the positive electrode plate 230, and will not be described again here.

[0053] In some embodiments, such as Figure 3 and Figure 4 As shown, along the first direction, the edge of the separator 250 extends beyond the first body edge 211 of the positive electrode 230, and the straight-line interval between the two is H2, which is 1.5 mm to 4 mm.

[0054] Specifically, the core of this embodiment is to ensure that the diaphragm 250 has sufficient extra length to achieve reliable compression positioning and electrical insulation within the housing assembly 1000. A reasonable extra length not only creates a stable clamping force during assembly but also absorbs minor deformations under vibration, impact, or thermal expansion conditions, preventing direct contact between the functional area 220 of the electrode 200 and the housing or tab 400, thereby reducing the risk of short circuits, active layer peeling, or wear.

[0055] For example, H2 can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm.

[0056] Specifically, if H2 is less than 1.5mm, the separator 250 will be too long, weakening the compression and fixing effect, which may increase the micro-movement of the cell within the casing 100 and reduce the overall stress coordination. If H2 is greater than 4mm, the separator 250 will be too long and prone to stacking or folding, which may affect assembly accuracy or local stress distribution. Therefore, controlling H2 within the range of 1.5mm to 4mm can balance assembly convenience and structural reliability. At the same time, when the battery cover assembly 300 is used to press against the bare cell 2000, a separator 250 within a reasonable range can also protect the insulation area 260.

[0057] In this embodiment, by reasonably setting H2, the diaphragm 250 can provide sufficient insulation and buffering functions, and can also achieve precise positioning of the battery cell in the casing and prevent displacement. Furthermore, without adding extra parts or complex processes, it can improve the battery cell's vibration resistance, fatigue life and long-term operational safety, while ensuring the electrical and mechanical safety of the electrode 200 functional area 220.

[0058] In some embodiments, such as Figure 3 and Figure 4 As shown, along the first direction, the edge of the diaphragm 250 extends beyond the second body edge 212 of the negative electrode 240, and the straight-line interval between the two is H3, where H3 is 1.5 mm to 4 mm.

[0059] Specifically, the core of this embodiment is to control the edge of the diaphragm 250 to extend beyond the second body edge 212 of the negative electrode 240 along the first direction by a certain distance, so as to ensure that the diaphragm 250 has a sufficient extension on the negative electrode 240 side for reliable compression positioning and electrical isolation with the housing assembly 1000.

[0060] For example, H3 can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm.

[0061] Specifically, if H3 is less than 1.5mm, the diaphragm 250 will not extend sufficiently, resulting in insufficient clamping force and potential micro-movements of the battery cell within the housing 100, reducing overall stress coordination and stability. If H3 is greater than 4mm, the excessive length of the diaphragm 250 may lead to folding or stacking, affecting assembly accuracy and causing localized stress concentration. Therefore, controlling H3 within the range of 1.5mm to 4mm balances structural safety and assembly operability.

[0062] This embodiment, through the rational design of H3, enables the diaphragm 250 to simultaneously provide reliable electrical isolation, buffering, and positioning functions, ensuring that the negative electrode 240 is precisely positioned within the casing and preventing displacement. Furthermore, it improves the cell's vibration resistance, fatigue life, and long-term operational safety without adding extra parts or complex processes.

[0063] In some embodiments, such as Figure 3 and Figure 4 As shown, the diaphragm 250 has a layer c along the second direction, and the thickness of the diaphragm 250 is d. The second direction is perpendicular to the first direction, and the product of c and d is 0.8 mm to 1.5 mm.

[0064] Specifically, by controlling the total thickness and number of layers of the diaphragm 250, its elastic deformation capacity and load-bearing stiffness under stress can be directly affected. The greater the thickness of the diaphragm 250 or the more layers it has, the greater its overall stiffness, which can more effectively support the battery cell and resist external extrusion. However, excessive stiffness may reduce the buffering performance. Conversely, appropriately reducing the thickness or number of layers can enhance the diaphragm 250's ability to buffer and absorb small displacements, thereby protecting the functional area 220 from direct pressure under vibration, shock, or thermal expansion conditions.

[0065] Therefore, a reasonable thickness product can ensure that the diaphragm 250 has sufficient elasticity and buffering performance when the outer shell is squeezed and fixed, without being too soft and causing insufficient clamping force. At the same time, it can absorb small displacements and stresses under vibration, impact or thermal expansion conditions, and protect the functional area 220 from direct pressure and wear.

[0066] For example, the product of c and d can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm.

[0067] Specifically, if the product of c and d is too small, the separator 250 will be too thin, resulting in insufficient compression, fixation, and buffering effects. This could cause the battery cell to wobble within the casing 100, reducing overall structural stability. Conversely, if the product of c and d is too large, the separator 250 will be too thick, potentially affecting assembly space and leading to localized stress concentration or assembly interference. Therefore, the product of c and d should be controlled within the range of 0.8 mm to 1.5 mm.

[0068] This embodiment, through the reasonable design of the number of layers and thickness of the diaphragm 250, enables the diaphragm 250 to not only provide reliable electrical isolation and buffering, but also to keep the bare cell 2000 stably positioned inside the casing.

[0069] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the housing assembly 1000 includes a housing 100 and a cover assembly 300. At least one end of the housing 100 along a first direction is an open end 110 with an opening. The cover assembly 300 includes a cover 320 and an insulating member 310. The cover 320 is closed and connected to the open end 110 and surrounds the housing 100 to form an accommodating space 120. The insulating member 310 is disposed on the side of the cover 320 facing the bare cell 2000, and the insulating member 310 is provided with a protruding structure 311 protruding towards the bare cell 2000. The bare cell 2000 includes a main body 2100 composed of a positive electrode 230, a negative electrode 240 and a separator 250. The main body 2100 includes a first end 2110 and a second end 2120 disposed opposite to each other along a first direction. A protruding structure 311 presses against a first region 2111 of the first end 2110. The battery also includes an insulating layer 2200 disposed between the bare cell 2000 and the cover plate assembly 300 and connected to the first end 2110. The insulating layer 2200 covers at least a portion of the first region 2111.

[0070] Specifically, the housing assembly 1000 includes a housing 100 and a cover plate assembly 300. The cover plate 320 is connected to the opening end 110 of the housing 100 by a covering method, forming a complete receiving space 120. At the same time, the insulating member 310 provided on the cover plate assembly 300 has a protruding structure 311. The protruding structure 311 presses the first region 2111 of the bare cell 2000 toward the first end 2110 of the bare cell 2000 in a first direction, thereby realizing the positioning and restriction of the bare cell 2000 in the direction of the cover plate 320, ensuring that the bare cell 2000 will not be displaced due to vibration or external force during assembly, transportation and use.

[0071] Furthermore, an insulating layer 2200 is provided between the protruding structure 311 and the bare cell 2000, and at least covers the first compressed region 2111. It should be noted that the first region 2111 may include a portion of the diaphragm 250 and the insulating region 260. Additionally, the insulating layer 2200 prevents the protruding structure 311 from directly contacting the functional region 220 or the electrode 200, ensuring electrical isolation, avoiding short circuits or localized overcurrents, and absorbing some stress during the compression process, reducing direct pressure on the active material layer, thereby reducing the risk of active layer peeling or material wear.

[0072] The above structure, through the combination of the protruding structure 311 and the insulating layer 2200, not only achieves stable positioning of the end of the bare cell 2000, but also ensures electrical safety and mechanical buffering, providing effective protection for the long-term reliable operation of the battery under conditions such as vibration, impact and thermal expansion.

[0073] Exemplarily, the insulating member 310 includes an insulating body and a protrusion structure 311 connected to each other. The insulating body may be generally plate-shaped, and the protrusion structure 311 is disposed on the surface of the insulating body facing the bare cell 2000 (hereinafter referred to as the bottom surface of the insulating body). Along a first direction, the protrusion structure 311 protrudes from the bottom surface of the insulating body in the direction facing the bare cell 2000, and the protrusion height is H4, where H4 is 6 mm to 10 mm.

[0074] Optionally, H4 can be 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm. Specifically, if H4 is too small, the protrusion structure 311 will not be able to provide sufficient clamping force, and the battery cell may experience slight movement in the direction of the cover plate 320, reducing the overall stress stability; if H4 is too large, the protrusion structure 311 may be too high and may exert excessive compressive force on the diaphragm 250 or functional area 220 during the pressing process, leading to material damage or local stress concentration. Therefore, H4 needs to be controlled within the range of 6mm to 10mm.

[0075] In this embodiment, the cooperation between the protruding structure 311 and the insulating layer 2200 enables the bare cell 2000 to be reliably positioned and fixed along the first direction under the action of the cover plate assembly 300, while achieving electrical isolation.

[0076] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, one end of the housing 100 along the first direction is an open end 110, and the other end is a closed end 140; the housing assembly 1000 includes a support member 130 disposed between the closed end 140 and the bare cell 2000, and the support member 130 presses against the second end 2120.

[0077] In this embodiment, a support member 130 is provided between the closed end 140 of the housing 100 and the bare battery cell 2000, so that the battery cell forms a structural system with double-end confinement and balanced support in the first direction. Specifically, one end of the housing 100 is an open end 110, used to install the cover plate assembly 300 to realize the assembly and sealing of the battery cell; the other end is a closed end 140, which abuts against the second end 2120 of the battery cell through the support member 130 to realize reverse confinement of the battery cell. This design can keep the battery cell in a stable axial position inside, preventing axial displacement or loosening under long-term vibration, transportation impact or thermal expansion conditions.

[0078] The support member 130, through its compression fit against the second end 2120 of the bare cell 2000, not only provides mechanical support but also absorbs some of the minor deformations caused by thermal expansion or assembly tolerances. This prevents concentrated stress at the end of the cell and avoids damage to the interlayer structure of the electrode 200 or misalignment of the internal materials of the bare cell 200. This design ensures structural stability while also considering the stability of flexible buffering and force transmission.

[0079] In addition, the support 130 is located inside the closed end 140 of the housing 100. Its thickness or material can be adjusted according to different cell sizes or assembly processes, so as to flexibly adapt to different cell structures and facilitate subsequent maintenance or replacement.

[0080] In this embodiment, by introducing a support member 130 at the closed end 140, the bare cell 2000 forms a reliable double-end support within the casing, which significantly improves the overall rigidity and vibration resistance of the structure. At the same time, it effectively alleviates the coupling effect of thermal stress and mechanical stress, and improves the reliability and safety of the cell during long-term cycling.

[0081] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the main body 2100 is a wound structure or a stacked structure.

[0082] When the main body 2100 adopts a wound structure, the electrode 200 and the separator 250 are tightly wound in a spiral shape, resulting in a continuous overall structure and uniform stress distribution. This allows for the inclusion of a longer electrode 200 within a limited space, thereby significantly improving the energy density per unit volume. Simultaneously, the wound structure exhibits excellent resistance to deformation, effectively mitigating internal stress caused by electrode expansion during charge-discharge cycles, making it suitable for high-energy-density, space-constrained battery cells.

[0083] When the main body 2100 adopts a stacked structure, the electrode plates 200 and the separator 250 are stacked layer by layer to form parallel layers, which can achieve high structural precision and consistency control. Especially in the application of large-area electrode plates 200, it can reduce internal resistance, improve heat dissipation performance, and facilitate automated layer detection and repair. This structure is more suitable for large-capacity, high-power energy storage cells, and performs outstandingly in terms of structural stability and safety.

[0084] The battery in this embodiment is compatible with both wound and stacked main body 2100 forms, and the bare cell 2000 structure can be flexibly adjusted according to application requirements to achieve full coverage design from high energy density to high safety. At the same time, the above-mentioned universal structural layout not only improves the scalability of cell design, but also provides basic support for customized energy storage system design in different scenarios.

[0085] In some embodiments, such as Figure 4 and Figure 5 As shown, the housing 100 has two open ends 110 along the first direction. The battery includes two cover plate assemblies 300 that correspond one-to-one with the two open ends 110. One of the two cover plate assemblies 300 presses the first end 2110 and the other presses the second end 2120.

[0086] The battery in this embodiment achieves a bidirectional limiting and symmetrical force design for the battery cell by making both ends of the casing 100 open at the first direction 110 and providing cover plate assemblies 300 at each end.

[0087] Specifically, the first end 2110 and the second end 2120 of the bare cell 2000 are respectively pressed and fixed by the corresponding cover plate assembly 300, forming a symmetrical clamping structure along the first direction. Compared with the layout of single-end sealing and single-end limiting, this structure can significantly improve the axial stability of the cell in the assembled state. When subjected to external impact, transportation vibration or thermal expansion stress, the double-end compression can effectively disperse the load, avoid axial displacement or skew of the cell in the cavity, and prevent uneven force on the edges of the electrode group 200, which could lead to peeling of the active layer or damage to the separator 250.

[0088] For example, along the first direction, both cover plate assemblies 300 can integrate insulating elements 310 or buffer structures, thereby providing elastic limiting functions for both ends of the battery cell while maintaining electrical safety isolation. This structure not only ensures the structural stability of the battery cell during long-term cycling but also improves its reliability and lifespan under complex operating conditions such as alternating high and low temperatures and mechanical vibration.

[0089] This embodiment adopts a double-ended opening and symmetrical extrusion design to achieve bidirectional limiting and force balance of the battery cell within the housing 100. This structure not only significantly improves the overall assembly stability and structural strength, but also forms a bidirectional buffer and stress dispersion path under external impact or vibration, effectively reducing the risk of local load concentration.

[0090] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in the details for the sake of brevity.

[0091] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: The outer casing assembly has an internal accommodating space. A bare battery cell is disposed within the receiving space; the bare battery cell includes at least two electrodes and a separator that isolates at least two adjacent electrodes; each electrode includes an electrode body, the electrode body including a first body edge and a second body edge spaced apart along a first direction, the separator extending beyond the first body edge and the second body edge along the first direction; the electrode body includes a functional region disposed between the first body edge and the second body edge, an active material layer being formed in the functional region, the functional region having a first functional edge near the first body edge and a second functional edge near the second body edge; The housing assembly at least compresses the portion of the diaphragm that extends beyond the first body edge and the portion that extends beyond the second body edge; along the first direction, the minimum straight-line distance between the first functional edge and the housing assembly is a, and the minimum straight-line distance between the second functional edge and the housing assembly is b, 0.4mm≤a+b≤1.0mm.

2. The battery according to claim 1, characterized in that, The electrode includes a positive electrode and a negative electrode. The positive electrode includes a tab connected to the edge of the first body. The electrode body of the positive electrode includes an insulating region extending from the first functional edge to the edge of the first body, and an insulating material layer is formed in the insulating region. Along the first direction, the first body edge of the positive electrode extends beyond the first functional edge of the negative electrode, and the straight-line interval between the two is H1, where H1 is 0.3 mm to 1.5 mm.

3. The battery according to claim 1 or 2, characterized in that, The electrode includes a positive electrode and a negative electrode. The negative electrode includes a tab connected to the edge of the first body or the edge of the second body. The electrode body of the negative electrode includes an insulating region disposed between the functional area and the tab, and an insulating material layer is formed in the insulating region.

4. The battery according to claim 2, characterized in that, Along the first direction, the edge of the separator extends beyond the first body edge of the positive electrode sheet, and the straight-line interval between the two is H2, where H2 is 1.5 mm to 4 mm.

5. The battery according to claim 2, characterized in that, Along the first direction, the edge of the diaphragm extends beyond the second body edge of the negative electrode sheet, and the straight-line interval between the two is H3, where H3 is 1.5 mm to 4 mm.

6. The battery according to claim 2, characterized in that, The diaphragm has a c layer along the second direction, and the thickness of the diaphragm is d. The second direction is perpendicular to the first direction, and the product of c and d is 0.8 mm to 1.5 mm.

7. The battery according to claim 2, characterized in that, The housing assembly includes a housing and a cover plate assembly. At least one end of the housing along the first direction is an open end with an opening. The cover plate assembly includes a cover plate and an insulating member. The cover plate is closed and connected to the open end and surrounds the housing to form the receiving space. The insulating member is disposed on the side of the cover plate facing the bare cell, and the insulating member is provided with a protruding structure protruding towards the bare cell. The bare cell includes a main body formed by the positive electrode, the negative electrode and the separator. The main body includes a first end and a second end disposed opposite to each other along the first direction. The protruding structure presses against a first region of the first end. The battery also includes an insulating layer disposed between the bare cell and the cover plate assembly and connected to the first end. The insulating layer covers at least a portion of the first region.

8. The battery according to claim 7, characterized in that, One end of the housing along the first direction is the open end, and the other end is the closed end; the housing assembly includes a support member disposed between the closed end and the bare cell, and the support member presses against the second end.

9. The battery according to claim 7, characterized in that, The main body is a wound structure or a stacked structure.

10. The battery according to claim 7, characterized in that, The casing has open ends at both ends along the first direction, and the battery includes two cover plate assemblies that correspond one-to-one with the two open ends. One of the two cover plate assemblies presses against the first end, and the other presses against the second end.

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