Battery case and battery

Abstract

The utility model discloses a battery shell and battery, this battery shell includes: casing, is enclosed and is formed with accommodation cavity, and the one side of casing is equipped with recess and through -hole in its peripheral direction, and the through -hole is located the groove bottom wall of recess, the cover plate, the cover is established on the casing and closes the accommodation cavity, the electrode assembly is installed in recess, and the electrode assembly includes electrode piece and insulating sleeve, and the insulating sleeve is sleeved in electrode piece and is with electrode piece and is worn in the through -hole, and the electrode assembly is no more than the outer surface of casing. The utility model discloses battery shell in the peripheral direction of casing one side is equipped with recess, through the electrode assembly is established in the recess of casing, and make the electrode assembly no more than casing outer surface, replace traditional convex type pole, effectively reduced the occupation of pole to battery top size space, and, also, reduced the risk of being hit, effectively reduce the casing weld cracking probability, significantly reduce the risk of leakage, improve the success rate of product through drop test, strengthen the reliability and safety of battery product.

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 space at the top of the battery due to their greater height, which affects the energy density of the battery and creates a stress concentration area. Under drop test conditions, the terminals are easily impacted, which can cause the weld seam of the casing to crack, greatly increasing the risk of leakage and making it difficult for the product to pass the drop test. Utility Model Content

[0005] The main purpose of this utility model is to propose a battery casing that aims to solve the technical problems of the current battery terminals protruding outwards, occupying a large space in the battery size, and causing stress concentration, making the casing welds prone to cracking during drop tests.

[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. The shell has a groove and a through hole on one side in the circumferential direction. The through hole is located on the bottom wall of the groove.

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

[0009] An electrode assembly is installed in the groove. The electrode assembly includes an electrode and an insulating sleeve. The insulating sleeve is fitted over the electrode and passes through the through hole. The electrode assembly is not higher than the outer surface of the housing.

[0010] Optionally, the electrode includes a vertical plate portion, a first horizontal plate portion, and a second horizontal plate portion, wherein the first horizontal plate portion and the second horizontal plate portion are disposed opposite to each other at both ends of the vertical plate portion and are connected to the vertical plate portion;

[0011] The vertical plate portion passes through the through hole, the first horizontal plate portion is located in the groove, and the second horizontal plate portion is located in the receiving cavity.

[0012] Optionally, the insulating sleeve is provided with a receiving cavity for accommodating the electrode, the receiving cavity including a first receiving cavity, a second receiving cavity and a third receiving cavity that communicate with each other, the third receiving cavity being located between the first receiving cavity and the second receiving cavity;

[0013] The first horizontal plate portion is housed in the first receiving cavity, the vertical plate portion passes through the third receiving cavity, and the second horizontal plate portion is housed in the second receiving cavity.

[0014] Optionally, the distance between the first transverse plate portion and the opening of the first receiving cavity is D1, satisfying: 0mm≤D1≤1mm; and / or,

[0015] The distance between the insulating sleeve and the groove opening is D2, satisfying: 0mm≤D2≤4mm; and / or,

[0016] The distance between the second horizontal plate and the opening of the second receiving cavity is D3, which satisfies: 0mm≤D3≤1mm.

[0017] Optionally, the electrode assembly further includes:

[0018] The adapter piece is housed within the second receiving cavity and is electrically connected to the electrode.

[0019] Optionally, the distance between the adapter piece and the opening of the second receiving cavity is D4, satisfying: 0mm≤D4≤1mm.

[0020] Optionally, the outer wall of the insulating sleeve is provided with a slot arranged circumferentially thereon, and the housing is embedded in the slot along the edge of the hole at the through hole.

[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] The present invention also proposes a battery comprising a cell and a battery casing as described above, wherein the cell is housed in the accommodating cavity of the battery casing.

[0023] Optionally, the side portion of the housing is provided with a protrusion that protrudes toward the receiving cavity, and the protrusion forms a corresponding groove on the outer wall of the housing;

[0024] One end of the battery cell is provided with a notch and a tab extending from the notch. The protrusion and the electrode assembly extend into the notch and are electrically connected to the electrode component.

[0025] This utility model's battery casing has a groove on one side of its circumferential direction. By placing the electrode assembly within this groove and ensuring it does not protrude above the outer surface of the casing, it replaces the traditional protruding terminals. This effectively reduces the space occupied by the terminals on the top of the battery, allowing for a larger design size for the casing and internal cells while maintaining the overall battery size, thus increasing the battery's energy density. Simultaneously, it avoids the stress concentration problem caused by protruding terminals. Under conditions such as drop tests, the electrode assembly, being flush with or recessed from the outer surface of the casing, also reduces the risk of impact, effectively decreasing the probability of weld cracking and significantly reducing the risk of leakage. This improves the success rate of drop tests and enhances the reliability and safety of the battery product. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the battery structure in one embodiment of the present invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the internal structure of a portion of the battery in the embodiment;

[0028] Figure 3 This is a schematic diagram of a portion of the battery in another embodiment of the present invention;

[0029] Label Explanation:

[0030] label name label name 100 Battery casing 110 case 111 groove 112 Through hole 120 cover plate 130 Electrode assembly 131 Electrode 132 Insulating sleeve 1311 Vertical section 1312 First horizontal section 1313 Second horizontal plate section 1321 Receiving cavity 13211 First receiving cavity 13212 Second receiving cavity 13213 Third cavity 133 Adapter 1322 Card slot 140 Welding sheet 200 battery cells 210 pole ear 220 Notch 113 Protrusion

[0031] 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

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] This utility model embodiment provides a battery casing 100, referring to... Figure 1 and Figure 2 The battery casing 100 includes:

[0037] The housing 110 is enclosed to form a cavity. The housing 110 has a groove 111 and a through hole 112 on one side in the circumferential direction. The through hole 112 is located on the bottom wall of the groove 111.

[0038] A cover plate 120 is placed on the housing 110 and closes the receiving cavity;

[0039] Electrode assembly 130 is installed in groove 111. Electrode assembly 130 includes electrode 131 and insulating sleeve 132. Insulating sleeve 132 is sleeved on electrode 131 and passes through through hole 112 with electrode 131. Electrode assembly 130 is not higher than the outer surface of housing 110.

[0040] like Figure 1As shown, the battery casing 100 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 100 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.

[0041] Among them, such as Figure 1 and Figure 2 As shown, the housing 110 has multiple sides in its circumferential direction, one of which is provided with a groove 111 and a through hole 112. The through hole 112 is disposed through the bottom wall of the groove 111. The groove 111 and the through hole 112 are used to install electrode assemblies 130, and the number is set according to the number of electrode assemblies 130. The groove 111 is a groove structure formed by recessing into the side of the housing 110, which is adapted to the electrode assembly 130. The through hole 112 is located in the bottom wall of the groove 111 and is disposed through the side of the housing 110.

[0042] Electrode assembly 130 is installed in groove 111. Electrode assembly 130 includes an electrode element 131 and an insulating sleeve 132. The insulating sleeve 132 is fitted over the electrode element 131, and both pass through through hole 112. Both the insulating sleeve 132 and the electrode element 131 are divided into two parts: one part is exposed in groove 111 and does not protrude above the outer surface of housing 110, and the other part passes through through hole 112 and is located in receiving cavity. Electrode assembly 130 does not protrude above the outer surface of housing 110, that is, electrode assembly 130 does not extend from the groove opening of groove 111, and electrode assembly 130 does not protrude from the outer surface of housing 110. Specifically, insulating sleeve 132 can be made of a material with good insulation properties, such as engineering plastic, and is formed by injection molding or other processes to ensure that it is tightly installed in through hole 112. The electrode component 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, and other processing techniques, and then precisely installed inside the insulating sleeve 132. The main function of the insulating sleeve 132 is to insulate the electrode component 131 from the casing 110, effectively preventing short circuits and ensuring the safe and stable operation of the battery.

[0043] Regarding the arrangement of the electrode assembly 130, there are two possibilities:

[0044] 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.

[0045] Secondly, the number of electrode assemblies 130 is set to two, and the two electrode assemblies 130 (i.e., electrode elements 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.

[0046] When the battery of this embodiment is put into use, the electrode 131 of 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 131 and the housing 110, preventing short circuits and ensuring the safety of battery operation.

[0047] In this embodiment, the battery casing 100 has a groove 111 on one side of the casing 110 in the circumferential direction. By placing the electrode assembly 130 in the groove 111 of the casing 110 and ensuring that the electrode assembly 130 is not higher than the outer surface of the casing 110, the traditional protruding electrode post is replaced. This effectively reduces the space occupied by the electrode post on the top dimension of the battery. Thus, the design size of the casing 110 and the internal cell can be increased without changing the overall size of the battery, thereby improving the energy density of the battery. At the same time, it avoids the stress concentration problem caused by the protruding electrode post. Under conditions such as drop tests, because the electrode assembly 130 is flush with or recessed from the outer surface of the casing 110, the risk of impact is also reduced, effectively reducing the probability of cracking of the weld of the casing 110, significantly reducing the risk of leakage, improving the success rate of the product in drop tests, and enhancing the reliability and safety of the battery product.

[0048] In some embodiments, refer to Figure 2 and Figure 3 The electrode component 131 includes a vertical plate portion 1311, a first horizontal plate portion 1312 and a second horizontal plate portion 1313. The first horizontal plate portion 1312 and the second horizontal plate portion 1313 are disposed opposite to each other at both ends of the vertical plate portion 1311 and are connected to the vertical plate portion 1311.

[0049] The vertical plate portion 1311 passes through the through hole 112, the first horizontal plate portion 1312 is located in the groove 111, and the second horizontal plate portion 1313 is located in the receiving cavity.

[0050] In this embodiment, the electrode component 131 comprises a vertical plate portion 1311, a first horizontal plate portion 1312, and a second horizontal plate portion 1313. The first horizontal plate portion 1312 and the second horizontal plate portion 1313 are disposed opposite to each other at both ends of the vertical plate portion 1311 and connected to the vertical plate portion 1311. The vertical plate portion 1311 passes through the through hole 112 to realize the positioning and installation of the electrode component 131 on the housing 110. The first horizontal plate portion 1312 is located in the groove 111 and can be connected to the external circuit for easy power output. The second horizontal plate portion 1313 is located in the accommodating cavity and can be electrically connected to internal components such as the battery cell to ensure that the internal power of the battery can be smoothly transmitted to the electrode component 131.

[0051] Specifically, the unique "I"-shaped structure of the electrode component 131 (a combination of a vertical plate 1311, a first horizontal plate 1312, and a second horizontal plate 1313) allows the vertical plate 1311 to have a through hole 112, the first horizontal plate 1312 to be placed in a groove 111, and the second horizontal plate 1313 to be located in a receiving cavity. This fully utilizes the space of the groove 111 and the receiving cavity of the housing 110, achieving a stable installation of the electrode assembly 130 without increasing the external dimensions of the battery. Furthermore, the first horizontal plate 1312, located within the groove 111, provides a larger contact area for connection with external circuits, reducing contact resistance and ensuring stable power output. The second horizontal plate 1313, connected to components such as the battery cell within the receiving cavity, also expands the connection area, ensuring the reliability of power transmission within the battery and improving the overall electrical performance of the battery.

[0052] In some embodiments, refer to Figure 2 and Figure 3 The insulating sleeve 132 is provided with a receiving cavity 1321 for accommodating the electrode 131. The receiving cavity 1321 includes a first receiving cavity 13211, a second receiving cavity 13212 and a third receiving cavity 13213 that are in communication. The third receiving cavity 13213 is located between the first receiving cavity 13211 and the second receiving cavity 13212.

[0053] The first horizontal plate portion 1312 is housed in the first receiving cavity 13211, the vertical plate portion 1311 passes through the third receiving cavity 13213, and the second horizontal plate portion 1313 is housed in the second receiving cavity 13212.

[0054] In this embodiment, the insulating sleeve 132 and the electrode 131 are conformally arranged, and the shape and size of each part of the receiving cavity 1321 are adapted to the corresponding part of the electrode 131. Specifically, the receiving cavity 1321 adopts a three-section cavity structure of a first receiving cavity 13211, a second receiving cavity 13212, and a third receiving cavity 13213. The first receiving cavity 13211, the third receiving cavity 13213, and the second receiving cavity 13212 are arranged sequentially along the axial direction of the insulating sleeve and connected to each other, so as to accurately accommodate the first horizontal plate portion 1312, the vertical plate portion 1311, and the second horizontal plate portion 1313 of the electrode 131, thereby achieving all-round and multi-layer insulation of the electrode 131, effectively preventing electrical faults such as leakage and short circuit between the electrode 131 and the shell 110, and significantly improving the insulation safety and stability of the battery.

[0055] In some embodiments, refer to Figure 3 The distance between the first horizontal plate portion 1312 and the opening of the first receiving cavity 13211 is D1, satisfying: 0mm≤D1≤1mm; and / or,

[0056] The distance between the insulating sleeve 132 and the groove 111 is D2, satisfying: 0mm≤D2≤4mm; and / or,

[0057] The distance between the second horizontal plate portion 1313 and the opening of the second receiving cavity 13212 is D3, which satisfies: 0mm≤D3≤1mm.

[0058] In this embodiment, optionally, the distance D1 between the first horizontal plate portion 1312 and the opening of the first receiving cavity 13211 is limited to 0mm≤D1≤1mm. For example, D1 can be set to 0mm, 0.5mm, 1mm, etc., according to actual needs. This limitation ensures that the end surface of the first horizontal plate portion 1312 of the electrode component 131 is flush with or recessed into the end surface of the insulating sleeve 132, thereby preventing the electrode component 131 from protruding from the end surface of the insulating sleeve 132, preventing accidental contact with the housing 110 or other non-insulating components, and ensuring the insulating protection effect of the insulating sleeve 132 on the electrode component 131. At the same time, when the first horizontal plate portion 1312 is connected to the external circuit, the distance is within a reasonable range, and poor contact will not occur due to excessive distance, ensuring a good electrical connection is always maintained, ensuring stable battery power output, and improving the overall electrical performance of the battery.

[0059] Optionally, the distance D2 between the insulating sleeve 132 and the groove 111 is limited to 0mm ≤ D2 ≤ 4mm. For example, D2 can be set to 0mm, 2mm, 4mm, etc., according to actual needs. This limitation allows the electrode assembly 130 to be flush with or recessed into the outer surface of the housing 110, thereby preventing the electrode assembly 130 from protruding from the outer surface of the housing 110.

[0060] Optionally, the distance D3 between the second horizontal plate portion 1313 and the opening of the second receiving cavity 13212 is limited to 0mm≤D3≤1mm. For example, D3 can be set to 0mm, 0.5mm, 1mm, etc., according to actual needs. This limitation ensures that the end surface of the second horizontal plate portion 1313 of the electrode 131 is flush with or recessed into the end surface of the insulating sleeve 132, thereby preventing the electrode 131 from protruding from the end surface of the insulating sleeve 132 and preventing accidental contact with the housing 110 or other non-insulated components, ensuring the insulating protection effect of the insulating sleeve 132 on the electrode 131. At the same time, when the second horizontal plate portion 1313 is connected to the internal components such as the electrode tab of the battery cell, the distance is within a reasonable range, preventing poor contact due to excessive distance, ensuring a good electrical connection, ensuring stable battery power output, and improving the overall electrical performance of the battery.

[0061] In some embodiments, refer to Figure 2 and Figure 3 The electrode assembly 130 also includes:

[0062] The adapter piece 133 is housed in the second receiving cavity 13212 and is electrically connected to the electrode 131.

[0063] In this embodiment, the adapter piece 133 can be sleeved on the electrode component 131 and used to connect with the battery cell's tab. Specifically, within the second receiving cavity 13212, the adapter piece 133 is sleeved on the second horizontal plate portion 1313 and / or vertical plate portion 1311 of the electrode component 131. The adapter piece 133 is made of a highly conductive material, and its shape and size are adapted to the second receiving cavity 13212 and the battery cell's tab. Reliable connection with the electrode component 131 and the battery cell's tab is achieved through welding, pressing, or other methods. The provision of the adapter piece 133 increases the flexibility and reliability of the connection between the electrode assembly 130 and the battery cell. Compared to the electrode component 131 being directly connected to the battery cell's tab, the adapter piece 133 can be specifically designed according to the position and shape of the battery cell's tab, adjusting the connection angle and position, reducing connection stress, lowering contact resistance, making power transmission more efficient and stable, and effectively improving the battery's charging and discharging performance and overall electrical performance. The reliable connection between the adapter piece 133 and the electrode component 131 and the cell tab can effectively disperse the stress generated by the battery during use due to charging, discharging, vibration and other factors. Through the transition connection of the adapter piece 133, problems such as loosening and breakage that may occur when the electrode component 131 is directly connected to the cell tab are avoided, which enhances the structural stability between the electrode assembly 130 and the cell, and improves the overall reliability and service life of the battery.

[0064] In some embodiments, refer to Figure 3 The distance between the adapter piece 133 and the opening of the second receiving cavity 13212 is D4, satisfying: 0mm≤D4≤1mm. In this embodiment, the distance D4 between the adapter piece 133 and the opening of the second receiving cavity 13212 is limited to 0mm≤D4≤1mm. For example, D4 ​​can be set to 0mm, 0.5mm, 1mm, etc., according to actual needs. This limitation ensures that the end surface of the adapter piece 133 is flush with or recessed into the end surface of the insulating sleeve 132, preventing accidental contact with the housing 110 or other non-insulated components, and ensuring the insulating protection effect of the insulating sleeve 132 on the adapter piece 133. At the same time, when the adapter piece 133 is connected to the internal components such as the electrode tab of the battery cell, the distance is within a reasonable range, preventing poor contact due to excessive distance, ensuring a good electrical connection, ensuring stable battery power output, and improving the overall electrical performance of the battery.

[0065] In some embodiments, refer to Figure 3The outer wall of the insulating sleeve 132 is provided with a groove 1322 arranged circumferentially thereon. The edge of the hole in the through hole 112 of the housing 110 is embedded in the groove 1322. The groove 1322 is arranged circumferentially around the outer wall of the insulating sleeve 132. The shape and size of the groove 1322 are adapted to the contour of the edge of the hole in the through hole 112 of the housing 110. After the edge of the hole in the through hole 112 of the housing 110 is embedded in the 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 groove 1322 is reserved in the mold design, so as to precisely control the shape and size of the groove 1322. The matching design of the slot 1322 and the edge of the hole in the through hole 112 of the housing 110 makes the installation process of the insulating sleeve 132 easier. During the assembly process, the edge of the hole in the through hole 112 of the housing 110 can be quickly and accurately inserted into the insulating sleeve 132, which reduces the assembly difficulty, improves production efficiency, and also helps to ensure product consistency and quality stability.

[0066] In some embodiments, refer to Figure 1 and Figure 2 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 element 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 polarities of the welding piece 140 and the electrode element 131 are opposite.

[0067] This utility model embodiment also proposes a battery, referring to... Figure 2The battery includes a cell 200 and a battery casing 100 as described in the foregoing embodiments, with the cell 200 housed in the receiving cavity of the battery casing 100. The specific structure of the battery casing 100 is as described in the foregoing embodiments. Since this battery adopts all the technical solutions of all the foregoing embodiments, it possesses at least all the technical effects brought about by the technical solutions of the foregoing embodiments, and will not be elaborated further here. The battery can be a lithium battery. In this battery, the cell 200 can be a laminated cell 200. The positive electrode tab 210 of the cell 200 is electrically connected to the electrode component 131 or other components electrically connected to the electrode component 131 (such as the adapter piece 133 in the foregoing embodiments), so that the electrode component 131 serves as the positive electrode of the battery. The negative electrode tab 210 of the cell 200 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.

[0068] In some embodiments, refer to Figure 2 The side portion of the housing 110 has a protrusion 113 that protrudes into the accommodating cavity, and the protrusion 113 forms a corresponding groove 111 on the outer wall of the housing 110.

[0069] One end of the battery cell 200 is provided with a notch 220 and a tab 210 extending from the notch. The protrusion 113 and the electrode assembly 130 extend into the notch 220 and are provided therein. The tab 210 is electrically connected to the electrode 131.

[0070] In this embodiment, as Figure 2 As shown, the protrusion 113 on the side of the housing 110 protrudes into the cavity and extends into the recess 220 of the cell 200. The electrode assembly 130 is simultaneously embedded. The tab 210 (such as the positive tab) of the cell 200 is directly electrically connected to the electrode 131 in the recess 220, realizing a compact layout of the electrode assembly 130 and the cell 200. This allows for a deep integration of the internal structure of the battery, maximizing the design size of the cell 200, thereby increasing the energy density of the battery.

[0071] 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 casing, characterized in that, include: The shell is enclosed to form an accommodating cavity. The shell has a groove and a through hole on one side in the circumferential direction. The through hole is located on the bottom wall of the groove. A cover plate is provided on the housing and closes the receiving cavity; An electrode assembly is installed in the groove. The electrode assembly includes an electrode and an insulating sleeve. The insulating sleeve is fitted over the electrode and passes through the through hole. The electrode assembly is not higher than the outer surface of the housing.

2. The battery casing according to claim 1, characterized in that, The electrode component includes a vertical plate portion, a first horizontal plate portion, and a second horizontal plate portion. The first horizontal plate portion and the second horizontal plate portion are disposed opposite to each other at both ends of the vertical plate portion and are connected to the vertical plate portion. The vertical plate portion passes through the through hole, the first horizontal plate portion is located in the groove, and the second horizontal plate portion is located in the receiving cavity.

3. The battery casing according to claim 2, characterized in that, The insulating sleeve is provided with a receiving cavity for accommodating the electrode, the receiving cavity including a first receiving cavity, a second receiving cavity and a third receiving cavity that communicate with each other, the third receiving cavity being located between the first receiving cavity and the second receiving cavity; The first horizontal plate portion is housed in the first receiving cavity, the vertical plate portion passes through the third receiving cavity, and the second horizontal plate portion is housed in the second receiving cavity.

4. The battery casing according to claim 3, characterized in that, The distance between the first horizontal plate portion and the opening of the first receiving cavity is D1, satisfying: 0mm≤D1≤1mm; and / or, The distance between the insulating sleeve and the groove opening is D2, satisfying: 0mm≤D2≤4mm; and / or, The distance between the second horizontal plate and the opening of the second receiving cavity is D3, which satisfies: 0mm≤D3≤1mm.

5. The battery casing according to claim 3, characterized in that, The electrode assembly also includes: The adapter piece is housed within the second receiving cavity and is electrically connected to the electrode.

6. The battery casing according to claim 5, characterized in that, The distance between the adapter piece and the opening of the second receiving cavity is D4, which satisfies: 0mm≤D4≤1mm.

7. The battery casing according to any one of claims 1 to 6, characterized in that, The outer wall of the insulating sleeve is provided with a slot arranged circumferentially thereon, and the housing is embedded in the slot along the edge of the hole at the through hole.

8. The battery casing according to any one of claims 1 to 6, 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.

9. A battery, characterized in that, It includes a battery cell and a battery case as described in any one of claims 1 to 8, wherein the battery cell is housed in the receiving cavity of the battery case.

10. The battery according to claim 9, characterized in that, The side portion of the housing is provided with a protrusion that protrudes toward the accommodating cavity, and the protrusion forms a corresponding groove on the outer wall of the housing; One end of the battery cell is provided with a notch and a tab extending from the notch. The protrusion and the electrode assembly extend into the notch and are electrically connected to the electrode component.

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