Battery

Abstract

The invention relates to the technical field of batteries, and discloses a battery. The battery comprises a battery shell, the battery shell comprises a shell body, and openings are formed in the two ends of the shell body; the first cover plate seals an opening in one end of the shell body, and the first cover plate comprises a first cover plate body and a first bending part located on the edge of the first cover plate body; the first cover plate and the shell body form an accommodating cavity, and the first bending part extends towards the accommodating cavity; the battery also comprises a battery cell which is arranged in the accommodating cavity; an insulating part is arranged between the battery cell and the first cover plate body, and the height of the insulating part is not lower than that of the first bending part. The first bending part extends towards the accommodating cavity, so that the utilization rate of the space in the shell is maximized, and the capacity of the battery is further improved. The height of the insulating part is higher than that of the first bending part or the height of the insulating part is the same as that of the first bending part, so that the insulating part is filled in a groove formed by the first cover plate body and the first bending part, and the interference and influence of the first bending part on the battery cell are reduced.

Description

[0001] This application is a divisional application of the invention patent application with publication number CN119029433A. The application date of the original application is: 2024.10.28; the application number is: 202411507438.9; the name of the invention is: battery. Technical Field

[0002] The present invention relates to the technical field of batteries, and in particular to batteries. Background Art

[0003] At present, battery applications are becoming more and more extensive, and more and more electronic devices are choosing rechargeable secondary batteries as power sources, such as mobile phones, laptops, power tools, and electric vehicles. In high-power battery applications, such as new energy vehicles and energy storage, many single cells are often required to be connected in series or in parallel, which also places high demands on battery costs.

[0004] An existing single battery usually includes a battery casing and a battery cell arranged in the battery casing. The battery casing includes a shell and two cover plates. When producing the battery, in order to ensure the welding strength between the shell and the cover plate, a folded edge is provided on the cover plate, and the cover plate is welded to the shell through the folded edge. If the cover plate bodies of the two cover plates are arranged on one side closer to the inner direction of the shell relative to the folded edge, the space utilization rate inside the shell is reduced, thereby affecting the capacity of the battery. Summary of the invention

[0005] In view of this, the present invention provides a battery to solve the problem of low space utilization inside the shell caused by the cover body of the cover being arranged at one side closer to the inside of the shell relative to the folded edge.

[0006] The present invention provides a battery, comprising: a battery shell, the battery shell comprising: a shell body, with openings at both ends; a first cover plate, sealing one end opening of the shell body, the first cover plate comprising a first cover plate body and a first bent portion located at the edge of the first cover plate body, the first bent portion being arranged around the first cover plate body and being welded and fixed to the shell body; wherein the first cover and the shell body form a accommodating cavity, and the first bent portion extends toward the accommodating cavity; the battery also comprises a battery cell, the battery cell is arranged in the accommodating cavity, and the first cover plate is used to support the battery cell; an insulating member is arranged between the battery cell and the first cover plate body, and the height of the insulating member is not lower than the height of the first bent portion.

[0007] Beneficial effect: The first bent portion extends toward the accommodating cavity, ensuring the maximum utilization of the space inside the shell, thereby increasing the capacity of the battery, and effectively solving the problem of low space utilization inside the shell caused by the cover body of the cover being arranged on one side relative to the folded edge close to the inside of the shell. The welding heat when the cover and the shell body are welded will not be fully transferred to the battery cell, thereby avoiding the situation where the diaphragm of the battery cell is damaged during the welding process, ensuring the safety and performance of the battery.

[0008] The height of the insulating member is higher than that of the first bending portion, or the height of the insulating member is the same as that of the first bending portion. Such a design allows the insulating member to be filled in the groove formed by the first cover body and the first bending portion, thereby reducing the interference and influence of the first bending portion on the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 A three-dimensional diagram of a battery housing according to an embodiment of the present invention;

[0011] Figure 2 for Figure 1 A top view of the battery housing shown;

[0012] Figure 3 for Figure 2 AA sectional view of the battery casing shown;

[0013] Figure 4 for Figure 3 A partial enlarged schematic diagram of B in the middle;

[0014] Figure 5 for Figure 3 A partial enlarged schematic diagram of C in the middle.

[0015] Description of reference numerals:

[0016] 1. Shell body; 101. Welding area;

[0017] 2. first cover plate; 201. first cover plate body; 202. first bending portion; 203. groove;

[0018] 3. Second cover plate; 301. Second cover plate body; 302. Second bending portion. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] In the related art, the bending and extending directions of the folded edges of the two cover plates are opposite. If the cover bodies of the two cover plates are arranged on the side closer to the inside of the shell relative to the folded edges, the space utilization inside the shell will be reduced, thereby affecting the capacity of the battery.

[0021] In order to solve the above problems, the following Figures 1 to 5 , describing an embodiment of the present invention.

[0022] According to an embodiment of the present invention, on one hand, a battery is provided, including: a battery housing, the battery housing including: a housing body 1 , a first cover plate 2 , and a second cover plate 3 .

[0023] Specifically, openings are provided at both ends of the shell body 1 .

[0024] The first cover plate 2 seals an opening at one end of the shell body 1 . The first cover plate 2 includes a first cover plate body 201 and a first bending portion 202 located at the edge of the first cover plate body 201 . The first bending portion 202 is arranged around the first cover plate body 201 and is welded and fixed to the shell body 1 .

[0025] The second cover plate 3 seals the other end opening of the shell body 1 . The second cover plate 3 includes a second cover plate body 301 and a second bending portion 302 located at the edge of the second cover plate body 301 . The second bending portion 302 is arranged around the second cover plate body 301 and is welded and fixed to the shell body 1 .

[0026] The first cover plate 2 , the second cover plate 3 and the shell body 1 form an accommodating cavity, the first bent portion 202 extends toward the accommodating cavity, and the second bent portion 302 extends in a direction away from the accommodating cavity.

[0027] In the battery using this embodiment, the arrangement direction from the first cover plate 2 to the second cover plate 3 is the first direction, and the first bending portion 202 of the first cover plate 2 and the second bending portion 302 of the second cover plate 3 are both bent and extended in the first direction, that is, the bending direction and the extension direction of the first bending portion 202 and the second bending portion 302 are the same, thereby maximizing the space utilization inside the shell, thereby improving the capacity of the battery, and effectively solving the problem of low space utilization inside the shell caused by the cover plate bodies of the two cover plates being arranged on one side close to the inner direction of the shell relative to the folded edge.

[0028] In the related art, the bending and extending directions of the folded edges of the two cover plates are opposite, so that the welding heat when the two cover plates are welded to the shell is completely transferred to the battery cell, thereby causing damage to the battery cell diaphragm, which will seriously affect the safety and performance of the battery.

[0029] In the present embodiment, the two cover plates have the same bending direction, and the welding heat when the two cover plates are welded to the shell body 1 will not be completely transferred to the battery cell, thereby preventing the diaphragm of the battery cell from being damaged during the welding process, thereby ensuring the safety and performance of the battery.

[0030] It should be noted that when the battery is subjected to external impact, the design of the two covers can provide better mechanical protection, enhance the battery's pressure resistance when subjected to external impact, reduce the risk of damage to the battery cell due to external force, and also absorb and disperse external vibrations to a certain extent, protecting the internal components of the battery from damage.

[0031] In one embodiment, Figure 3 As shown, the battery also includes a battery cell, which is arranged in the accommodating cavity, and the first cover plate 2 is used to support the battery cell. The battery cell is arranged on the first cover plate 2, and the weight of the battery cell has little effect on the weld between the first cover plate 2 and the shell body 1. Therefore, the first cover plate 2 has a good supporting effect on the battery cell, which can significantly improve the safety, reliability and service life of the battery.

[0032] In the related art, the battery casing includes a shell and a cover plate. An opening is set at one end of the shell, and the end of the shell away from the opening has four corners. The material of the shell is stainless steel, and the shell is formed by stamping a stainless steel plate. Since the ductility of stainless steel is relatively poor, the corners are easily broken when the shell is molded, making molding difficult.

[0033] In order to solve the above problems, in this embodiment, both ends of the shell body 1 are provided with openings, and the two cover plates are welded to the two ends of the shell body 1, and the first bent portion 202 of the first cover plate extends toward the accommodating cavity, so that the welding reliability of the first cover plate 2 and the shell body 1 can be ensured. If the first bent portion 202 of the first cover plate 2 extends in a direction away from the accommodating cavity, when the first cover plate 2 carries the battery cell, the battery cell applies a force perpendicular to the first cover plate body 201 to the first cover plate body 201, and the force can be similar to a tearing force, which can easily tear the first cover plate off the shell body, thereby affecting the welding reliability of the first cover plate and the shell body. After the first bent portion 202 of the first cover plate 2 is extended toward the accommodating cavity, the gravity of the battery cell acts on the first cover plate body 201 of the first cover plate 2, and the gravity is similar to a pulling force, which has little effect on the weld between the first cover plate 2 and the shell body 1, thereby improving the reliability of the weld of the shell.

[0034] In one embodiment, Figure 5As shown, the ratio of the height h1 to the thickness T1 of the first bend portion 202 is in the range of 0.6 to 0.9. The height of the first bend portion 202 refers to the size of the first bend portion 202 in the direction perpendicular to the upper surface of the first cover body 201, that is, the height of the first bend portion 202 refers to the distance from the top of the first bend portion 202 close to the accommodating cavity to the side of the first cover body 201 close to the accommodating cavity, and the thickness of the first bend portion 202 refers to the distance from the outer wall surface of the first bend portion 202 to the inner wall surface of the first bend portion 202.

[0035] Specifically, the height h1 of the first bending portion 202 is Figure 5 The vertical dimension of the first bent portion 202, the thickness T1 of the first bent portion 202, is Figure 5 The lateral dimension of the first bending portion 202.

[0036] Furthermore, if the ratio of the height h1 of the first bend portion 202 to the thickness T1 is too small, it means that the height of the first bend portion 202 is too small or the thickness of the first bend portion 202 is too thick. If the first bend portion 202 is too thick, the first bend portion 202 will interfere more with the battery cell and easily damage the battery cell. If the height of the first bend portion 202 is too small, the welding area 101 between the first bend portion 202 and the shell body is smaller, and the welding strength between the shell body 1 and the first cover plate 2 is lower.

[0037] If the ratio of the height h1 of the first bending portion 202 to the thickness T1 is too large, it means that the height of the first bending portion 202 is too large or the thickness of the first bending portion 202 is too small. If the height of the first bending portion 202 is too large, it will affect the insertion of the battery cell into the shell, and further affect the assembly of the battery. If the thickness of the first bending portion 202 is too small, during the welding process between the shell body 1 and the first bending portion 202, the first bending portion 202 is easily welded through to form welding slag, affecting the safety of the battery.

[0038] Therefore, when the ratio of the height h1 to the thickness T1 of the first bend portion 202 is in the range of 0.6 to 0.9, the welding strength between the first cover plate 2 and the shell body 1 can be guaranteed, while the size of the first bend portion 202 is controlled, reducing the interference of the first bend portion 202 on the battery cell, thereby ensuring the safety and capacity of the battery cell.

[0039] Furthermore, the first bending portion 202 has a height ranging from 0.3 mm to 0.8 mm and a thickness ranging from 0.35 mm to 0.9 mm.

[0040] Specifically, the height of the first bending portion 202 may be preferably 0.4 mm, 0.45 mm, 0.48 mm, 0.5 mm, 0.55 mm, 0.58 mm, 0.6 mm, 0.65 mm or 0.7 mm. The thickness of the first bending portion 202 may be preferably 0.4 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.8 mm or 0.85 mm.

[0041] In one embodiment, Figure 5 As shown, the welding area 101 between the shell body 1 and the first bend portion 202 is located on the surface of the shell body 1, and the welding area 101 does not penetrate the first bend portion 202. The welding area 101 does not penetrate the first bend portion 202, which can reduce the fine holes or cracks caused by full penetration welding, thereby improving the sealing of the battery, preventing electrolyte leakage or external contaminants from entering the battery, and reducing the risk of leakage. Incomplete penetration welding retains the integrity of the material and avoids the material weakening that may occur during full penetration welding, thereby maintaining the structural strength of the shell and the cover plate, and can also reduce such stress concentration and improve the fatigue resistance of the welding area 101.

[0042] It should be noted that the welding area 101 is Figure 5 The gray area in .

[0043] In one embodiment, an insulating member (not shown in the figure) is arranged between the battery cell and the first cover body 201, that is, the insulating member is arranged between the battery cell and the first cover body 201, and the insulating member can effectively isolate the electrical connector on the cover from the battery cell to prevent the risk of short circuit caused by poor contact. The insulating member can serve as a buffer layer to reduce the mechanical stress between the cover and the battery cell and prevent damage to the battery cell caused by vibration or collision. The insulating member usually has a low thermal conductivity, which can reduce the heat exchange between the battery cell and the external environment, and help maintain the temperature stability of the battery cell. The electrolyte around the battery cell may corrode the metal cover, and the insulating member can prevent such chemical corrosion. The insulating member can enhance the sealing performance of the battery and prevent electrolyte leakage or external contaminants from entering the battery.

[0044] Furthermore, the height of the insulating member is not less than the height of the first bent portion 202, that is, the height of the insulating member is higher than the height of the first bent portion 202, or the height of the insulating member is the same as the height of the first bent portion 202. Such a design allows the insulating member to be filled in the groove 203 formed by the first cover body 201 and the first bent portion 202, thereby reducing the interference and influence of the first bent portion 202 on the battery cell. The height of the insulating member refers to the distance from the top of the insulating member close to the accommodating cavity to the bottom of the insulating member away from the accommodating cavity.

[0045] Specifically, a taller insulating member can provide better electrical isolation and prevent short circuits between the battery cell and the cover plate due to contact. A taller insulating member can act as a buffer layer to further reduce direct contact between the cover plate and the battery cell and protect the battery cell from mechanical stress. A taller insulating member can better seal the interior of the battery, prevent pollutants such as moisture and dust from entering the battery, and improve the battery's waterproof and dustproof rating. A taller insulating member can better prevent the electrolyte from leaking out of the gap between the cover plate and the shell. A taller insulating member can provide an additional thermal barrier, reduce heat exchange between the battery cell and the external environment, and help maintain the temperature stability of the battery cell.

[0046] In one embodiment, Figure 5 As shown, the ratio of the distance m between the welding area 101 of the shell body 1 and the first bending portion 202 and the side of the first bending portion 202 close to the insulating member to the thickness T1 of the first bending portion 202 is in the range of 65% to 90%. The distance m refers to the distance between the side of the welding area 101 close to the insulating member and the side of the first bending portion 202 close to the insulating member, that is, Figure 5 The lateral dimension between the inner side of the welding area 101 and the inner side surface of the first bending portion 202.

[0047] Furthermore, if the ratio of m to T1 is small, the welding heat during welding will affect the battery cell, thereby affecting the safety of the battery; if the ratio of m to T1 is large, the welding strength between the first cover plate 2 and the shell is small, and the welding firmness between the first cover plate 2 and the shell cannot be guaranteed.

[0048] Therefore, the ratio of m to T1 is in the range of 65% to 90%, which can ensure the welding strength between the first cover plate 2 and the shell, while ensuring the distance between the welding area 101 and the battery cell, reducing the impact of welding heat on the battery cell.

[0049] Specifically, the ratio of m to T1 may preferably be 70%, 75%, 78%, 70% or 85%.

[0050] In one embodiment, the distance between the first bend portion 202 and the insulating member is 0.1 mm to 0.8 mm. The distance between the first bend portion 202 and the insulating member refers to the distance between a side surface of the first bend portion 202 close to the insulating member and a side surface of the insulating member close to the first bend portion 202, that is, the distance between the inner side surface of the first bend portion 202 and the outer side surface of the insulating member.

[0051] Furthermore, if the distance between the first bending portion 202 and the insulating part is large, the possibility of contact between the battery cell and the first bending portion is increased, affecting the safety of the battery; if the distance between the first bending portion 202 and the insulating part is small, the welding heat generated during the welding of the first bending portion and the shell body 1 affects the insulating part, thereby affecting the performance of the insulating part.

[0052] Therefore, the distance between the first bent portion 202 and the insulating member is within the range of 0.1 mm to 0.8 mm, ensuring that welding heat does not affect the insulating member during welding and reducing the possibility of contact between the battery cell and the first bent portion.

[0053] Specifically, the distance between the first bending portion 202 and the insulating member may preferably be 0.2 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm or 0.7 mm.

[0054] In one embodiment, Figure 3 As shown, the battery further includes a pole, which is arranged on the second cover plate 3. Since the second bent portion 302 of the second cover plate 3 extends in a direction away from the accommodating cavity, when the pole is placed on the second cover plate 3, the pole is placed in a recess formed by the second bent portion 302 and the second cover plate body 301, thereby reducing the influence of the pole on the overall height of the single battery, thereby reducing the height of the entire battery. The pole is arranged on the second cover plate 3, which can reduce the height of the pole protruding from the shell and improve space utilization. The pole is connected to the pole ear of the battery cell through a connecting sheet.

[0055] In one embodiment, the battery further comprises a cell, and the cell comprises a tab, which is located on the side of the cell facing the second cover plate 3 and connected to the pole. The location of the tab can shorten the current transmission path, reduce the contact resistance, and thus improve the reliability of the electrical connection. Since the tab and the pole are close, the current transmission efficiency is higher, and the energy loss caused by long-distance transmission is reduced. The shorter connection distance can reduce the accumulation of mechanical stress and avoid wear or breakage caused by long-term use.

[0056] In one embodiment, Figure 4 and Figure 5 As shown, the ratio of the height h1 of the first bend 202 to the height h2 of the second bend 302 is 0.6:1 to 0.88:1. Since the first bend 202 is located inside the accommodating cavity and the second bend 302 is located outside the accommodating cavity, the length of the first bend 202 needs to be smaller than the length of the second bend 302, so that the battery cell can be set higher in the height direction of the shell, which can further improve the utilization rate of the internal space of the shell and increase the capacity of the battery; at the same time, since the second bend 302 is on the same side as the pole, its length needs to be increased to prevent the heat during welding from affecting the pole.

[0057] Specifically, the ratio of the height h1 of the first bending portion 202 to the height h2 of the second bending portion 302 may preferably be 0.65:1, 0.7:1, 0.75:1, 0.8:1 or 0.85:1.

[0058] In one embodiment, Figure 4 As shown, the battery shell is made of stainless steel, and the first cover plate 2, the second cover plate 3 and the shell body 1 are all made of stainless steel. Stainless steel has the advantages of good corrosion resistance, high strength, excellent thermal expansion performance and thermal insulation performance, good impermeability, good safety, and weldability.

[0059] Furthermore, the thickness T of the shell body 1 is 0.3 mm to 0.8 mm. The thickness of the shell body 1 refers to the distance between the inner surface and the outer surface of the shell body 1, that is, Figure 4 The lateral dimension of the housing body 1.

[0060] If the shell is thicker, the overall weight of the battery will increase, which will in turn affect the weight of the electric vehicle; a thicker shell body 1 requires more materials, which will increase manufacturing costs and take up more space, and may not be suitable for space-constrained application scenarios. If the shell is thinner, it is not as mechanically strong as a thicker shell and is easily deformed or damaged by external forces; a thinner shell has a weaker ability to protect the battery cell and may not be able to effectively prevent damage to the battery cell caused by external impact or extrusion.

[0061] Therefore, the thickness T of the shell body 1 is 0.3 mm to 0.8 mm, which can ensure the strength of the shell body 1 while controlling the material cost, manufacturing cost, and occupied space.

[0062] It is understandable that in another embodiment, the battery housing may be made of other materials, and is not limited thereto.

[0063] In one embodiment, the first cover plate 2 is fixed to the shell body 1 by penetration welding. The welding is performed from the outer surface of the shell body 1 to the first bent portion 202, and the first cover plate 2 is welded to the shell. The penetration welding has the advantages of high-strength connection, good sealing, wide applicability, and high welding quality.

[0064] It is understandable that, in another embodiment, the first cover plate 2 and the shell body 1 may also be butt-welded.

[0065] In one embodiment, the second cover plate 3 is also fixed to the shell body 1 by penetration welding. The welding is performed from the outer surface of the shell body 1 to the second bending portion 302. The penetration welding has the advantages of high-strength connection, good sealing, wide applicability, and high welding quality.

[0066] It is understandable that, in another embodiment, the second cover plate 3 and the shell body 1 may also be butt-welded.

[0067] In one embodiment, the first cover body 201 and the first bending portion 202 are formed by bending a plate, and the second cover body 301 and the second bending portion 302 are formed by bending a plate. The two cover plates are processed from plates, which is easy to process and reduces manufacturing costs.

[0068] According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising: the above-mentioned battery.

[0069] Furthermore, a battery pack combines multiple batteries and their related components to form a complete energy storage unit. The design and structural composition of a battery pack usually need to consider multiple factors, including but not limited to safety, reliability, thermal management, electrical connections, etc.

[0070] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: A battery housing, the battery housing comprising: The housing body (1) has openings at both ends; A first cover plate (2) for sealing an opening at one end of the shell body (1), the first cover plate (2) comprising a first cover plate body (201) and a first bent portion (202) located at the edge of the first cover plate body (201), the first bent portion (202) being arranged around the first cover plate body (201) and being welded and fixed to the shell body (1); Wherein, the first cover plate (2) and the shell body (1) form a receiving cavity, and the first bent portion (202) extends toward the receiving cavity; The battery further comprises a battery cell, the battery cell is arranged in the accommodating cavity, and the first cover plate (2) is used for supporting the battery cell; An insulating member is provided between the battery core and the first cover plate body (201), and the height of the insulating member is not lower than the height of the first bent portion (202).

2. The battery according to claim 1, characterized in that The ratio of the height h1 to the thickness T1 of the first bending portion (202) is in the range of 0.6 to 0.

9.

3. The battery according to claim 1, characterized in that The welding area between the shell body (1) and the first bent portion (202) is located on the surface of the shell body (1), and the welding area does not penetrate the first bent portion (202).

4. The battery according to claim 1, characterized in that The ratio of the distance m between the welding area of ​​the shell body (1) and the first bent portion (202) and the side surface of the first bent portion (202) close to the insulating component to the thickness T1 of the first bent portion is in the range of 65% to 90%.

5. The battery according to claim 1, characterized in that The distance between the first bent portion (202) and the insulating component is 0.1 mm to 0.8 mm.

6. The battery according to any one of claims 1 to 2, characterized in that The battery shell is made of stainless steel, and the thickness T of the shell body (1) is 0.3 mm to 0.8 mm.

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