Battery case and battery

Abstract

The utility model discloses a battery case and battery, the battery case includes: the casing, is enclosed and is formed with the accommodation cavity, one side of the casing is equipped with the through -hole in its peripheral direction, the cover board, the cover is equipped on the casing and closes the accommodation cavity, electrode assembly, be located in the casing, the electrode assembly includes the polar plate and insulating sleeve, the insulating sleeve is equipped in the through -hole department, the polar plate is fixed in the insulating sleeve. The utility model battery case, the electrode assembly of being equipped on the casing, adopt the structure design of polar plate and insulating sleeve, replace traditional convex type pole, reduce the height and the space occupied, thereby can under the condition that the battery overall size is invariable, increase the design size of casing and internal electric core, improve the energy density of battery.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a battery casing and a battery. Background Technology

[0002] With the booming development of new energy technologies, lithium batteries are widely used in consumer electronics and other fields due to their outstanding advantages such as high energy density, long cycle life and low self-discharge rate.

[0003] In the core structural design of lithium batteries, the terminal assembly, as the connecting component between the battery and the external circuit, is usually fixed to the battery casing using a riveting process.

[0004] However, due to the limited overall size constraints of the battery, the protruding terminals occupy a large amount of space at the top of the battery due to their height, which affects the energy density of the battery. Utility Model Content

[0005] The main purpose of this utility model is to propose a battery casing that aims to solve the technical problem that the protruding battery terminals occupy the top space and restrict the improvement of battery energy density.

[0006] To achieve the above objectives, this utility model proposes a battery casing, which includes:

[0007] The shell is enclosed to form an accommodating cavity, and the shell has a through hole on one side in the circumferential direction;

[0008] A cover plate is provided on the housing and closes the receiving cavity;

[0009] An electrode assembly includes an electrode plate and an insulating sleeve, wherein the insulating sleeve is disposed at the through hole and the electrode plate is fixed inside the insulating sleeve.

[0010] Optionally, the inner wall of the insulating sleeve is provided with a first groove arranged circumferentially thereon, and the electrode plate is embedded in the first groove.

[0011] Optionally, the length of the electrode plate is L, satisfying: L≥2.8mm; and / or,

[0012] The embedding depth of the electrode plate is C1, satisfying: 0.2mm ≤ C1 ≤ 0.4mm; and / or,

[0013] The distance between the electrode plate and the wall of the through hole is D, which satisfies: 0.3mm≤D≤1mm.

[0014] Optionally, the thickness of the insulating sleeve is T1, satisfying: 0.3mm ≤ T1 ≤ 0.8mm; and / or,

[0015] The thickness of the electrode plate is T2, which satisfies: 0.08mm≤T2≤0.12mm.

[0016] Optionally, the outer wall of the insulating sleeve is provided with a second groove arranged circumferentially thereon, and the housing is embedded in the second groove at the edge of the hole at the through hole.

[0017] Optionally, the embedment depth of the housing at the edge of the through hole is C2, satisfying: 0.2mm≤C2≤1mm.

[0018] Optionally, the insulating sleeve is bonded to the housing; and / or,

[0019] The electrode plate is bonded to the insulating sleeve.

[0020] Optionally, the insulating sleeve is a heat-melting insulating sleeve.

[0021] Optionally, the housing is further provided with a welding piece on one side in the circumferential direction, the welding piece being spaced apart from the electrode assembly and electrically connected to the housing.

[0022] This utility model also proposes a battery, which includes a battery cell and a battery casing as described above, wherein the battery cell is housed in the receiving cavity of the battery casing and is electrically connected to the electrode plates.

[0023] In this utility model battery casing, the electrode assembly on the casing adopts a structure design of electrode plates and insulating sleeves, replacing the traditional protruding electrode posts, reducing the height and space occupied. Thus, the design size of the casing and internal cells can be increased without changing the overall size of the battery, thereby improving the energy density of the battery. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the battery casing in one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of a portion of the battery casing in another embodiment of the present invention;

[0026] Figure 3 for Figure 2 A schematic diagram of a portion of the battery casing in the embodiment from another perspective;

[0027] Figure 4 for Figure 3 A cross-sectional view of a portion of the battery casing in the embodiment;

[0028] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0029] Figure 6This is a schematic diagram of a portion of the battery casing in another embodiment of the present invention;

[0030] Figure 7 This is an exploded view of the electrode assembly of the battery casing in another embodiment of the present invention; Attached image description:

[0032]

[0033]

[0034] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0036] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0037] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0038] Furthermore, the use of terms such as "first" and "second" in this utility model is 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0039] This utility model embodiment provides a battery casing, referring to... Figure 1 and Figure 2The battery casing includes:

[0040] The housing 110 encloses and forms a receiving cavity, and the housing 110 has a through hole on one side in the circumferential direction;

[0041] A cover plate 120 is placed on the housing 110 and closes the receiving cavity;

[0042] The electrode assembly 130 includes an electrode plate 131 and an insulating sleeve 132. The insulating sleeve 132 is installed at the through hole, and the electrode plate 131 is fixed inside the insulating sleeve 132.

[0043] like Figure 1 As shown, the battery casing involved in this embodiment mainly consists of a casing 110, a cover plate 120, and an electrode assembly 130. The casing 110 encloses a cavity for accommodating core components such as the battery cells. Specifically, the casing 110 includes a bottom and a side portion surrounding the periphery of the bottom. The side portion and the bottom together enclose the cavity, and the opening of the cavity is positioned opposite to the bottom along the thickness direction of the casing 110 to allow the battery cells to be inserted into the cavity. The shape of the casing 110 can be customized according to actual needs; for example, the casing 110 can be a rectangular casing. The cover plate 120 covers the casing 110 and seals the cavity by covering its opening, thus forming a complete battery casing structure together with the casing 110, providing protection and sealing for the internal battery cells. In the actual manufacturing process, the housing 110 can be made of high-strength metal materials, such as stainless steel, and processed into a cavity structure with a specific shape and size through stamping, forming and other processes to ensure that it has sufficient strength and rigidity to withstand external impacts and internal pressure. The cover plate 120 is also made of a suitable metal material and is tightly connected to the housing 110 through welding, riveting and other methods to ensure the sealing of the accommodating cavity.

[0044] The housing 110 has multiple sides in its circumferential direction, one of which has a through hole for mounting the electrode assembly 130. The number of through holes is determined by the number of electrode assemblies 130. The electrode assembly 130 comprises an electrode plate 131 and an insulating sleeve 132. The insulating sleeve 132 is installed at the through hole, and the electrode plate 131 is fixed inside the insulating sleeve 132. Specifically, the insulating sleeve 132 can be made of a material with good insulating properties, such as engineering plastics, and is formed by injection molding or other processes to ensure it is tightly fitted at the through hole. The electrode plate 131 is made of a suitable conductive material, such as copper or aluminum, according to the battery's electrical performance requirements. It is manufactured into a specific shape and size through cutting, stamping, or other processing processes and precisely installed inside the insulating sleeve 132. The electrode plate 131 can be a polygonal electrode plate 131, and the insulating sleeve 132 can be a corresponding polygonal insulating sleeve 132. The polygons involved can be rectangles, triangles, etc. The main function of the insulating sleeve 132 is to insulate the electrode plate 131 from the housing 110, effectively preventing short circuits and ensuring the safe and stable operation of the battery. The thickness of the electrode plate 131 is no greater than the thickness of the insulating sleeve 132; optionally, the thickness of the electrode plate 131 is less than the thickness of the insulating sleeve 132. This design helps to better control the overall height of the electrode assembly 130 and reduce its space occupation.

[0045] Regarding the arrangement of the electrode assembly 130, there are two possibilities:

[0046] Firstly, the housing 110 may be provided with only one electrode assembly 130. In this case, the electrode assembly 130 and the housing 110 serve as electrodes of different polarities. For example, the electrode assembly 130 corresponds to the positive electrode assembly 130, while the housing 110 serves as the negative electrode.

[0047] Secondly, the number of electrode assemblies 130 is set to two, and the two electrode assemblies 130 (i.e., electrode plates 131) have opposite polarities and are arranged at intervals on the housing 110. Specifically, one of the two electrode assemblies 130 corresponds to the positive electrode assembly 130, and the other corresponds to the negative electrode assembly 130.

[0048] When the battery of this embodiment is put into use, the electrode plate 131 in the electrode assembly 130 serves as a conductive component connecting the battery to the external circuit, responsible for conducting current. Due to the presence of the insulating sleeve 132, reliable insulation is achieved between the electrode plate 131 and the housing 110, preventing short circuits and ensuring the safety of battery operation.

[0049] During battery charging and discharging, current is exchanged with the external circuit through the electrode plate 131. Compared with the traditional protruding electrode structure, the electrode assembly 130 in this embodiment has a lower structural height and occupies less space. In this way, the size of the battery cell can be increased without changing the overall size of the battery, thereby increasing the capacity of the battery cell, improving the battery energy density, and thus providing a more durable and stable power supply for external devices.

[0050] In some embodiments, refer to Figures 3 to 5 The inner wall of the insulating sleeve 132 is provided with a first groove 1321 arranged circumferentially therearound, and the electrode plate 131 is embedded in the first groove 1321. The first groove 1321 is arranged circumferentially around the inner wall of the insulating sleeve 132, and the shape and size of the first groove 1321 are adapted to the outer contour of the electrode plate 131. After the electrode plate 131 is embedded in the first groove 1321, the two can form a tight fit. During the manufacturing process, the insulating sleeve 132 can be formed by injection molding. The molding space for the first groove 1321 is reserved in the mold design, thereby precisely controlling the shape and size of the first groove 1321. The adaptive design of the first groove 1321 and the electrode plate 131 makes the installation process of the electrode plate 131 simpler. During the assembly process, the electrode plate 131 can be quickly and accurately embedded into the insulating sleeve 132, reducing the assembly difficulty, improving production efficiency, and also helping to ensure product consistency and quality stability. Furthermore, the electrode plate 131 is embedded in the first groove 1321 of the insulating sleeve 132, achieving a tight fit and fixation with the insulating sleeve 132, so that it will not rotate relative to the insulating sleeve 132, which can prevent the electrode plate 131 from contacting the housing 110 and causing a short circuit, thus helping to improve the safety of the product.

[0051] In some embodiments, refer to Figure 6 The length of electrode 131 is L, which satisfies: L≥2.8mm; and / or,

[0052] The embedding depth of electrode 131 is C1, satisfying: 0.2mm ≤ C1 ≤ 0.4mm; and / or,

[0053] The distance between the electrode plate 131 and the wall of the through hole is D, which satisfies: 0.3mm≤D≤1mm.

[0054] In this embodiment, optionally, as Figure 6As shown, the length L of the electrode plate 131 in the electrode assembly 130 is limited to L≥2.8mm. For example, L can be set to 2.8mm, 3mm, 3.2mm, etc. This parameter setting is closely related to the battery manufacturing process and actual application requirements. During battery production, the electrode plate 131 is wrapped by an insulating sleeve 132 to isolate it from the external environment and ensure electrical safety, but the wrapped part cannot be used for welding connections. Therefore, setting the length L of the electrode plate 131 to ≥2.8mm ensures that after removing the insulating material wrapping part, the electrode plate 131 still has sufficient exposed area to meet the process requirements of tab welding.

[0055] Specifically, from a manufacturing process perspective, tab welding is a crucial step in connecting the battery to the external circuitry. The tabs must be securely fixed to the electrode plate 131 through welding to ensure stable current conduction. Insufficient weldable area on the electrode plate 131 can lead to poor contact, resulting in high resistance, overheating, and even the risk of desoldering during battery charging and discharging. Setting the length of the electrode plate 131 to at least 2.8mm ensures sufficient surface area for welding, providing a reliable adhesion base for tab welding and effectively enhancing the mechanical strength and conductivity of the weld joint.

[0056] Optionally, such as Figure 6 As shown, the embedding depth C1 of the electrode plate 131 of the electrode assembly 130 is limited to the range of 0.2mm ≤ C1 ≤ 0.4mm. For example, C1 can be set to 0.2mm, 0.3mm, 0.4mm, etc. This parameter setting is based on a comprehensive consideration of battery sealing, welding process compatibility, and overall performance stability. During battery assembly, the electrode plate 131 needs to be embedded in the first groove 1321 of the insulating sleeve 132. The embedding depth directly affects the wrapping effect of the insulating sleeve 132 on the electrode plate 131 and the effective exposed area of ​​the terminal post, thereby determining the battery's safety and electrical connection reliability.

[0057] From a sealing perspective, if the embedding depth C1 of the electrode plate 131 is less than 0.2mm, it is difficult to form a tight and complete wrapping structure between the insulating sleeve 132 and the electrode plate 131, easily resulting in gaps at their joint. During battery use, these gaps may lead to electrolyte leakage or the intrusion of external moisture and impurities into the battery, affecting not only the battery's electrochemical performance but also potentially causing safety hazards such as short circuits. Setting the lower limit of the embedding depth to 0.2mm ensures sufficient contact area and wrapping force between the insulating sleeve 132 and the electrode plate 131, forming an effective sealing barrier and ensuring a stable internal environment for the battery. From a welding process compatibility perspective, if the embedding depth C1 of the electrode plate 131 exceeds 0.4mm, the insulating sleeve 132 wraps the electrode plate 131 too deeply, significantly reducing the exposed area of ​​the electrode post. The exposed area of ​​the electrode post directly affects the operating space and welding quality of tab welding. Insufficient area will make it difficult to accurately position during tab welding, limiting the contact area of ​​the welding point, increasing the risk of incomplete soldering and desoldering, and consequently affecting the conductivity of the battery and external circuitry. Setting the maximum embedding depth to 0.4mm ensures sufficient exposed area for tab welding while maintaining airtightness. This allows for precise operation of the welding equipment and guarantees good mechanical strength and conductivity at the weld joint. By strictly controlling the embedding depth of electrode 131 to 0.2mm≤C1≤0.4mm, a balance is achieved between battery airtightness, welding performance, and manufacturing process, ensuring safe and stable battery operation and reliable electrical connection.

[0058] Optionally, such as Figure 6 As shown, the distance D between the electrode plate 131 of the electrode assembly 130 and the wall of the through hole in the housing 110 is limited to the range of 0.3mm ≤ D ≤ 1mm. For example, D can be set to 0.3mm, 0.65mm, 1mm, etc. This parameter setting is based on a comprehensive consideration of battery insulation performance, space utilization, and structural stability. During battery assembly, the distance between the electrode plate 131 and the wall of the through hole directly affects the insulation protection effect and the layout efficiency of the electrode assembly, thus having a critical impact on the battery's safety and energy density.

[0059] From an insulation performance perspective, if the spacing D is less than 0.3mm, the distance between the electrode plate 131 and the casing 110 is too close, compressing the filling space of the insulating material and making it difficult to form an insulation barrier of sufficient thickness. This reduces the insulation resistance between the casing 110 and the electrode, potentially leading to leakage and, in severe cases, short circuits or even fires. Setting the lower limit of the spacing to 0.3mm ensures that the insulating sleeve 132 forms a reliable insulating layer between the electrode plate 131 and the through hole, effectively isolating the electrical connection and ensuring battery safety. From a space utilization perspective, if the spacing D exceeds 1mm, the area occupied by the electrode assembly at the head of the casing 110 will increase significantly, excessively compressing the space for other components. Setting the upper limit of the spacing to 1mm minimizes the space occupied by the electrode assembly while ensuring insulation performance, providing more space for other components. By strictly controlling the spacing between the electrode plate 131 and the through hole to 0.3mm≤D≤1mm, synergistic optimization of insulation performance, space utilization, and manufacturing process is achieved, providing key technical support for the design and production of high-performance batteries.

[0060] In some embodiments, refer to Figure 7 The thickness of the insulating sleeve 132 is T1, satisfying: 0.3mm ≤ T1 ≤ 0.8mm; and / or,

[0061] The thickness of the electrode plate 131 is T2, which satisfies: 0.08mm≤T2≤0.12mm.

[0062] In this embodiment, optionally, as Figure 7 As shown, the thickness T1 of the insulating sleeve 132 is limited to the range of 0.3mm ≤ T1 ≤ 0.8mm. For example, T1 can be set to 0.3mm, 0.55mm, 0.8mm, etc. This parameter setting is based on the systematic optimization of battery structural strength, space utilization, and insulation reliability. It aims to improve the overall battery performance by precisely controlling the thickness of the insulating sleeve 132 to balance the wrapping strength and the height of the electrode assembly. As a key insulating component between the electrode plate 131 and the shell 110, the thickness of the insulating sleeve 132 directly affects the mechanical properties and spatial layout of the wrapping structure. If the thickness T1 is less than 0.3mm, the wrapping layer of the insulating sleeve 132 on the shell 110 and the electrode plate 131 is too thin and cannot withstand the internal stress or external impact generated during battery charging and discharging, resulting in insufficient wrapping strength. This may lead to risks such as the insulating sleeve 132 cracking and the electrode plate 131 shifting, thereby damaging the insulation effect and causing a short circuit. If the thickness T1 exceeds 0.8mm, the overall height of the electrode assembly 130 increases significantly, not only occupying the head space of the housing 110 but also compressing the volume of the cell housing cavity, leading to a decrease in battery energy density. By limiting T1 to the range of 0.3mm to 0.8mm, a better balance in structural design can be achieved while ensuring the wrapping strength and avoiding unnecessary space occupation.

[0063] Optionally, such as Figure 7 As shown, the thickness T2 of the electrode plate 131 of the electrode assembly 130 is limited to the range of 0.08mm ≤ T2 ≤ 0.12mm. For example, T2 can be set to 0.08mm, 0.1mm, 0.12mm, etc. This parameter setting is based on a comprehensive consideration of battery electrical performance, structural compactness, and manufacturing process feasibility. By precisely controlling the thickness of the electrode plate 131, an optimized balance between welding reliability and space utilization is achieved. As a key component connecting the internal and external circuits of the battery, the thickness of the electrode plate 131 directly affects the current conduction efficiency and the overall height of the electrode assembly 130. If the thickness T2 is less than 0.08mm, the mechanical strength of the electrode plate 131 is insufficient, and it is prone to deformation or breakage during tab welding, resulting in an uneven welding interface, increased contact resistance, and potential local overheating or even solder joint detachment after long-term use. If the thickness T2 exceeds 0.12mm, the height of the electrode plate 131 itself increases, which will significantly increase the overall height of the electrode assembly, compress the space for the battery cell within the casing 110, and reduce the battery energy density. By limiting T2 to the range of 0.08mm to 0.12mm, it is possible to ensure that the electrode plate 131 has sufficient welding load-bearing capacity and effectively control the height of the electrode post, thereby achieving dual optimization of electrical performance and space design.

[0064] In some embodiments, refer to Figures 3 to 5 The outer wall of the insulating sleeve 132 is provided with a second groove 1322 arranged circumferentially therearound. The edge of the through hole of the housing 110 is embedded in the second groove 1322. The second groove 1322 is arranged circumferentially around the outer wall of the insulating sleeve 132. The shape and size of the second groove 1322 are adapted to the contour of the edge of the through hole of the housing 110. After the edge of the through hole of the housing 110 is embedded in the second groove 1322, the two can form a tight fit. During the manufacturing process, the insulating sleeve 132 can be formed by injection molding. The molding space of the second groove 1322 is reserved in the mold design, so as to precisely control the shape and size of the second groove 1322. The matching design of the second groove 1322 and the edge of the through hole of the housing 110 makes the installation process of the insulating sleeve 132 simpler. During the assembly process, the edge of the through hole of the housing 110 can be quickly and accurately embedded in the insulating sleeve 132, reducing the assembly difficulty, improving production efficiency, and also helping to ensure product consistency and quality stability. Furthermore, the second groove 1322 of the insulating sleeve 132 is embedded in the edge of the hole at the through hole of the housing 110, so that the insulating sleeve 132 is installed and fixed on the housing 110. This prevents the insulating sleeve 132 from causing the electrode plate 131 to rotate relative to the housing 110, thus avoiding short circuits caused by contact between the electrode plate 131 and the housing 110, which helps to improve the safety of the product.

[0065] In some embodiments, refer toFigure 6 The embedment depth of the housing 110 at the edge of the through hole is C2, which satisfies the condition: 0.2mm ≤ C2 ≤ 1mm. In this embodiment, the embedment depth C2 of the housing 110 at the edge of the through hole is limited to the range of 0.2mm ≤ C2 ≤ 1mm. For example, C2 can be set to 0.2mm, 0.6mm, 1mm, etc. This parameter limitation is based on a comprehensive consideration of the connection performance and processing feasibility of the insulating sleeve 132 and the housing 110.

[0066] From a sealing perspective, if the embedding depth C2 is less than 0.2mm, the contact area between the edge of the hole in the housing 110 at the through-hole and the second groove 1322 of the insulating sleeve 132 is insufficient, making it difficult to form an effective sealing structure. Electrolyte can easily leak out from the connection gap, and external moisture, dust, and other impurities can easily penetrate the battery, leading to decreased battery performance or even failure. Setting the lower limit of the embedding depth C2 to 0.2mm ensures a tight, enveloping seal between the two, effectively preventing the penetration of liquids and gases. If the embedding depth C2 is greater than 1mm, for the housing 110 with a flange 111 on the edge, the distance between the insulating sleeve 132 and the flange 111 of the housing 110 is too close. During subsequent processing, interference between the insulating sleeve 132 and the flange is very likely to occur, making normal processing difficult. Setting the upper limit of the embedding depth C2 to 1mm avoids contact between the insulating sleeve 132 and the flange 111 of the housing 110, ensuring the smooth progress of each processing step.

[0067] In some embodiments, the insulating sleeve 132 is bonded to the housing 110; and / or,

[0068] The electrode plate 131 is bonded to the insulating sleeve 132.

[0069] In this embodiment, optionally, the insulating sleeve 132 and the housing 110 are connected by adhesive. For example, based on the embedded fit between the second groove 1322 surrounding the outer wall of the insulating sleeve 132 and the edge of the hole at the through hole of the housing 110, a special adhesive is applied to the contact interface between the two. The sealing and fixing performance is enhanced by the molecular force and mechanical locking effect of the adhesive.

[0070] Optionally, the electrode plate 131 and the insulating sleeve 132 are connected by adhesive bonding. For example, based on the embedded fit between the first groove 1321 surrounding the inner wall of the insulating sleeve 132 and the electrode plate 131, a special adhesive is applied to the contact interface between the two. The sealing and fixing performance is enhanced by the molecular force and mechanical locking effect of the adhesive.

[0071] In the selection of adhesives, priority should be given to materials with high insulation, high bonding strength and resistance to electrolyte corrosion, such as epoxy resin-based adhesives or silicone rubber adhesives.

[0072] In some embodiments, the insulating sleeve 132 is a heat-fusible insulating sleeve 132. The insulating sleeve 132 can be made of materials such as polyamide, thermoplastic polyester elastomer, or ethylene-vinyl acetate copolymer, which possesses good mechanical strength, chemical corrosion resistance, and insulation properties at room temperature, and can melt rapidly when heated to a certain temperature. Specifically, this embodiment uses a heat-fusible insulating sleeve 132 as a key safety component. Within the normal operating temperature range (e.g., -20℃ to 60℃), the insulating sleeve 132 remains solid, tightly wrapping the electrode plate 131 and firmly fitting with the housing 110, achieving reliable insulation and fixation functions. When the battery's internal temperature rises sharply (e.g., reaching approximately 130℃) due to abnormal conditions such as short circuits, overcharging, or thermal runaway, the insulating sleeve 132 melts rapidly upon heating. The originally tightly fitted insulating sleeve 132 forms a gap channel between itself, the housing 110, and the electrode post, providing a release path for the high-temperature, high-pressure gas accumulated inside the cell, thereby achieving early pressure relief.

[0073] In some embodiments, refer to Figure 1 The housing 110 also has a welding piece 140 on one side of its circumferential direction. The welding piece 140 is spaced apart from the electrode assembly 130 and electrically connected to the housing 110. In this embodiment, to optimize the electrode connection method, a welding piece 140 is also provided on one side of the housing 110 in the circumferential direction. The welding piece 140 and the electrode assembly 130 are spaced apart on the housing 110 and are electrically connected to the housing 110 by welding. The welding piece 140 and the electrode assembly 130 respectively perform electrode functions of different polarities: specifically, the welding piece 140 is welded to the housing 110 and then electrically connected to the negative electrode tab of the battery cell to form the negative electrode of the battery; while the electrode plate 131 in the electrode assembly 130 is electrically connected to the positive electrode tab of the battery cell to serve as the positive electrode of the battery. That is, the polarity of the welding piece 140 and the electrode plate is opposite.

[0074] This utility model embodiment also proposes a battery, which includes a battery cell and a battery casing as described in the foregoing embodiments. The battery cell is housed in the receiving cavity of the battery casing and is electrically connected to the electrode plate 131. The specific structure of the battery casing is the same as described in the foregoing embodiments. Since this battery adopts all the technical solutions of all the foregoing embodiments, it has at least all the technical effects brought about by the technical solutions of the foregoing embodiments, and will not be described in detail here. The battery can be a lithium battery. In this battery, the battery cell can be a laminated battery cell. The positive electrode tab of the battery cell is electrically connected to the electrode plate 131 so that the electrode plate 131 serves as the positive electrode of the battery. The negative electrode tab of the battery cell is connected to the casing 110 so that the casing 110 or other components electrically connected to it on the casing 110 (such as the welding piece 140 in the foregoing embodiments) serve as the positive electrode.

[0075] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A battery case, characterized in that, include: The shell is enclosed to form an accommodating cavity, and the shell has a through hole on one side in the circumferential direction; A cover plate is provided on the housing and closes the receiving cavity; An electrode assembly includes an electrode plate and an insulating sleeve, wherein the insulating sleeve is disposed at the through hole and the electrode plate is fixed inside the insulating sleeve.

2. The battery casing according to claim 1, characterized in that, The inner wall of the insulating sleeve is provided with a first groove arranged circumferentially thereon, and the electrode plate is embedded in the first groove.

3. The battery casing according to claim 2, characterized in that, The length of the electrode plate is L, satisfying: L≥2.8mm; and / or, The embedding depth of the electrode plate is C1, satisfying: 0.2mm ≤ C1 ≤ 0.4mm; and / or, The distance between the electrode plate and the wall of the through hole is D, which satisfies: 0.3mm≤D≤1mm.

4. The battery casing according to claim 1, characterized in that, The thickness of the insulating sleeve is T1, satisfying: 0.3mm ≤ T1 ≤ 0.8mm; and / or, The thickness of the electrode plate is T2, which satisfies: 0.08mm≤T2≤0.12mm.

5. The battery casing according to claim 1, characterized in that, The outer wall of the insulating sleeve is provided with a second groove arranged circumferentially thereon, and the housing is embedded in the second groove at the edge of the hole at the through hole.

6. The battery casing according to claim 5, characterized in that, The embedment depth of the housing at the edge of the through hole is C2, which satisfies: 0.2mm≤C2≤1mm.

7. The battery casing according to claim 1, characterized in that, The insulating sleeve is bonded to the housing; and / or The electrode plate is bonded to the insulating sleeve.

8. The battery casing according to any one of claims 1 to 7, characterized in that, The insulating sleeve is a heat-melting insulating sleeve.

9. The battery casing according to any one of claims 1 to 7, characterized in that, The housing is further provided with a welding piece on one side in the circumferential direction. The welding piece is spaced apart from the electrode assembly and electrically connected to the housing.

10. A battery, characterized in that, The battery includes a battery cell and a battery casing as described in any one of claims 1 to 9, wherein the battery cell is housed in the receiving cavity of the battery casing and is electrically connected to the electrode plate.

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