A battery

Abstract

This invention belongs to the field of battery technology and discloses a battery including an electrode assembly, a cover plate assembly, and a housing. The electrode assembly has a protrusion at its end in a first direction, and a first mounting groove and a second mounting groove are provided in the electrode assembly. The first mounting groove is located at the end of the electrode assembly, and the second mounting groove is located on the side of the electrode assembly in a second direction. The electrode assembly has a first tab and a second tab. The cover plate assembly includes a first cover plate body, a second cover plate body, and a plurality of terminals. The terminals are electrically connected to the first tab and the second tab, respectively. The first cover plate body includes a snap-fit ​​portion that engages with the protrusion. Along the first direction, the snap-fit ​​portion protrudes from the surface of the electrode assembly and is positioned away from the terminals. The housing, together with the first cover plate body and the second cover plate body, forms an accommodating space for housing the electrode assembly. Along the second direction, the housing protrudes from the terminals. This improves the structural strength of the cover plate assembly and the protective effect on the terminals.

Description

Technical Field

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

[0002] Lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage. As lithium-ion battery technology matures, the requirements for the performance and safety of lithium-ion batteries are also increasing.

[0003] In related technologies, a battery includes an electrode assembly, a cover plate, and a housing. The cover plate and the housing can enclose a space for accommodating the electrode assembly. The cover plate is usually provided with a terminal post and a rivet block. The end of the electrode assembly is provided with a tab. The electrode assembly and the terminal post are electrically connected through the tab.

[0004] However, the cover plate is usually a flat structure. After the rivet blocks and terminals are assembled onto the cover plate, they protrude from the cover plate. This makes it easy for the rivet blocks and terminals to be bumped and damaged during transportation, assembly and other processes. The cover plate has poor protection for the rivet blocks and terminals. The rivet blocks and terminals also occupy a lot of external space. The space utilization of the cover plate is low, which affects the battery capacity and assembly ratio. Furthermore, the structural strength of the connection between the electrode assembly and the cover plate is low. During the process of pushing the electrode assembly into the shell, it is easy to cause damage and movement of the electrode sheets. It may also cause the cover plate to deform under the action of external force, which affects the battery safety. Summary of the Invention

[0005] The purpose of this invention is to provide a battery that solves the problems of low strength of the cover plate structure and poor protection of the terminals and rivet blocks.

[0006] To achieve this objective, the present invention adopts the following technical solution: A battery includes: an electrode assembly, wherein the electrode assembly has a protrusion at one end in a first direction, the electrode assembly has a first mounting groove and a second mounting groove, the first mounting groove being disposed at the end of the electrode assembly, and the second mounting groove being disposed on the side of the electrode assembly in a second direction; the electrode assembly has a first tab and a second tab, the first tab being disposed within the first mounting groove, and the second tab being disposed within the second mounting groove; and a cover plate assembly, the cover plate assembly including a first cover plate body, a second cover plate body, and a plurality of terminal posts, the first cover plate body being disposed corresponding to the position of the first mounting groove, and the second cover plate body being disposed within the position of the first mounting groove. The body is positioned corresponding to the second assembly slot. The poles are electrically connected to the first and second poles, respectively. The first cover plate body includes a snap-fit ​​portion that snaps into the protrusion. Along the first direction, the snap-fit ​​portion protrudes from the poles away from the surface of the pole assembly. The housing, together with the first and second cover plate bodies, forms an accommodating space for accommodating the pole assembly. Along the second direction, the housing protrudes from the poles. The first direction is the thickness direction of the first cover plate body, and the second direction is the length direction of the first cover plate body.

[0007] Preferably, the cover plate assembly further includes a first welding block and a second welding block, both of which are connected to the pole post. The first welding block and the second welding block are respectively disposed on both sides of the corresponding first cover plate body or the second cover plate body, and the second welding block is connected to the corresponding first pole tab or the second pole tab.

[0008] Preferably, the first assembly groove includes a first part and a second part, the first part being disposed at the end of the electrode group, the second part being disposed on the side of the electrode group in the second direction, and the first electrode tab being disposed in the first part and the second part.

[0009] Preferably, the first cover plate body is provided with a bent portion at the position corresponding to the second part, and the width of the bent portion is L along the second direction, the thickness of the second welding block is T2, and the condition 2.1mm≤L-T2≤20mm is satisfied; and / or, along the first direction, the height of the first cover plate body corresponding to the position of the first assembly groove is H2, and the condition 20mm≤H2≤85mm is satisfied.

[0010] Preferably, the area of ​​the pole post in the first assembly groove away from the pole group is S1, and the area of ​​the first welding block away from the pole group is S2, and the condition 0.15≤S1 / S2≤0.33 is satisfied; and / or, along the first direction, the height of the snap-fit ​​portion protruding from the first welding block is H1, and the condition 5.5mm≤H1≤25mm is satisfied.

[0011] Preferably, the cover plate assembly further includes a first plastic and a second plastic, wherein the first plastic is connected to the first welding block and the second plastic is connected to the second welding block.

[0012] Preferably, the protrusion includes an inclined surface, which is disposed on both sides of the protrusion in the second direction, and the length of the protrusion on the side away from the electrode group is less than its length on the side facing the electrode group.

[0013] Preferably, the thickness of the first cover plate body is T1, and satisfies 1.5mm≤T1≤3mm; and / or, the included angle between the two inclined surfaces corresponding to the first cover plate body is N, and satisfies 60°≤N≤120°.

[0014] Preferably, along the second direction, the length of the snap-fit ​​portion toward the pole group is W, and the length of the first cover plate body is A, satisfying 0.35≤W / A≤0.6; and / or, along the third direction, the width of the first cover plate body is B, satisfying 16mm≤B≤100mm.

[0015] Preferably, the battery further includes an explosion-proof valve, which is disposed on the second cover plate body.

[0016] The beneficial effects of this invention are: A battery includes an electrode assembly, a cover plate assembly, and a housing. The electrode assembly has a protrusion at its end in a first direction. The electrode assembly has a first mounting groove and a second mounting groove. The first mounting groove is located at the end of the electrode assembly, and the second mounting groove is located on the side of the electrode assembly in a second direction. The electrode assembly has a first tab and a second tab, with the first tab disposed in the first mounting groove and the second tab disposed in the second mounting groove. The cover plate assembly includes a first cover plate body, a second cover plate body, and a plurality of terminals. The first cover plate body is positioned corresponding to the first mounting groove, and the second cover plate body is positioned corresponding to the second mounting groove. The terminals are electrically connected to the first tab and the second tab, respectively. The first cover plate body includes a snap-fit ​​portion that engages with the protrusion. Along the first direction, the snap-fit ​​portion protrudes from the surface of the electrode assembly and extends beyond the terminals. The housing, together with the first cover plate body and the second cover plate body, forms an accommodating space for housing the electrode assembly. Along the second direction, the housing protrudes beyond the terminals. The first direction is the thickness direction of the first cover plate body, and the second direction is the length direction of the first cover plate body.

[0017] In this way, the protrusion not only increases the battery's capacity and assembly ratio, but also allows the electrode assembly to engage with the first cover plate body, improving the connection stability between the electrode assembly and the first cover plate body. Placing the terminals on both sides of the protrusion improves the protection of the terminals, preventing them from being bumped and damaged during transportation, assembly, and other processes. It also increases the structural strength of the first cover plate body, making it less prone to deformation under external forces, thus improving battery safety. Furthermore, it makes full use of the space at the ends and sides of the electrode assembly, improving space utilization and making the battery structure more compact. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the battery structure in one embodiment of the present invention; Figure 2 This is a cross-sectional view of a battery in one embodiment of the present invention; Figure 3 This is an exploded view of the cover plate assembly and the housing in one embodiment of the present invention; Figure 4 This is a schematic diagram of the pole group structure in one embodiment of the present invention; Figure 5 This is a schematic diagram of the first structure of the first cover plate body in one embodiment of the present invention; Figure 6 This is a schematic diagram of the second structure of the first cover plate body in one embodiment of the present invention; Figure 7 This is a schematic diagram of the first structure of the second cover plate body in one embodiment of the present invention; Figure 8 This is a schematic diagram of the second structure of the second cover plate body in one embodiment of the present invention; Figure 9 This is a top view of the second cover plate body in one embodiment of the present invention; Figure 10 This is one embodiment of the present invention. Figure 9 AA section view; Figure 11 This is a bottom view of the first cover plate body in one embodiment of the present invention; Figure 12 This is a cross-sectional view of the first cover plate body in one embodiment of the present invention; Figure 13 This is a top view of the first cover plate body in one embodiment of the present invention; Figure 14 This is a side view of the first cover plate body in one embodiment of the present invention; Figure 15 This is a first exploded view of the cover plate assembly in one embodiment of the present invention; Figure 16 This is a second exploded view of the cover plate assembly in one embodiment of the present invention.

[0019] In the picture: 1. Pole assembly; 11. Protrusion; 111. Inclined surface; 12. First assembly slot; 121. First part; 122. Second part; 13. Second assembly slot; 14. First electrode ear; 15. Second electrode ear; 2. Cover plate assembly; 21. First cover plate body; 211. Snap-fit ​​part; 212. Bending part; 22. Second cover plate body; 23. Pole post; 231. Sealing ring; 24. First welding block; 25. Second welding block; 26. First plastic; 27. Second plastic; 3. Housing; 31. First reinforcing part; 32. Second reinforcing part; 4. Explosion-proof valve; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] See Figures 1 to 4 This invention provides a battery, including an electrode assembly 1, a cover plate assembly 2, and a housing 3. The electrode assembly 1 has a protrusion 11 at its end in a first direction, and has a first mounting groove 12 and a second mounting groove 13. The first mounting groove 12 is located at the end of the electrode assembly 1, and the second mounting groove 13 is located on the side of the electrode assembly 1 in a second direction Y. The electrode assembly 1 has a first tab 14 and a second tab 15, with the first tab 14 located in the first mounting groove 12 and the second tab 15 located in the second mounting groove 13. The cover plate assembly 2 includes a first cover plate body 21, a second cover plate body 22, and a plurality of terminal posts 23. The first cover plate body 21 corresponds to the first mounting groove. Position 12, second cover plate body 22 corresponding to the position of second assembly groove 13, pole post 23 electrically connected to first pole ear 14 and second pole ear 15 respectively, first cover plate body 21 includes a snap-fit ​​part 211 snap-fitted with protrusion 11, snap-fit ​​part 211 protruding from pole post 23 away from the surface of pole group 1 along the first direction X; housing 3, first cover plate body 21 and second cover plate body 22 enclose to form an accommodating space for accommodating pole group 1, housing 3 protruding from pole post 23 along the second direction Y; first direction X is the thickness direction of first cover plate body 21, second direction Y is the length direction of first cover plate body 21.

[0025] In this embodiment, the protrusion 11 is integrally formed with the electrode group 1 to improve the overall power of the battery. There are two electrode groups 1. The ends of the two electrode groups 1 that are close to each other are provided with a conductive coating to realize the electrical connection between the two electrode groups 1. The protrusion 11 is provided at the ends of the two electrode groups 1 that are far from each other. The ends of the electrode groups 1 are provided with two first mounting grooves 12. The two first mounting grooves 12 are provided on both sides of the protrusion 11 in the first direction X. The corresponding second mounting grooves 13 of the two electrode groups 1 are provided on the side of the ends that are close to each other. When the two electrode groups 1 are assembled, the second mounting grooves 13 of the two electrode groups 1 are connected to facilitate the installation of the second cover plate body 22. The shape of the snap-fit ​​part 211 is adapted to the shape of the protrusion 11 so that the snap-fit ​​part 211 fits the protrusion 11. The first cover plate body 21 and the second cover plate body 22 are both sealed and fixedly connected to the housing 3 by welding. The shape of the housing 3 is adapted to the shape of the electrode group 1.

[0026] Thus, the protrusion 11 at the end of the electrode assembly 1 not only increases the battery's capacity but also allows the electrode assembly 1 to engage with the first cover plate body 21, improving the connection stability between the electrode assembly 1 and the first cover plate body 21. It also enhances the protection of the terminal posts 23, preventing damage during transportation and assembly processes. Furthermore, it improves the structural strength of the first cover plate body 21, preventing damage and movement of the electrode assembly 1 during casing installation and deformation of the first cover plate body 21, thereby improving battery safety. The terminal posts 23 on both sides of the protrusion 11 fully utilize the space at the end of the electrode assembly 1, increasing space utilization and improving the battery's assembly ratio. This provides ample assembly space at the end of the electrode assembly 1, facilitating connection between the battery and external circuits and allowing for series and parallel connections of multiple batteries.

[0027] See Figures 5 to 8 In some embodiments, the cover plate assembly 2 further includes a first welding block 24 and a second welding block 25. Both the first welding block 24 and the second welding block 25 are connected to the pole post 23. The first welding block 24 and the second welding block 25 are respectively disposed on both sides of the corresponding first cover plate body 21 or the second cover plate body 22. The second welding block 25 is connected to the corresponding first pole tab 14 or the second pole tab 15.

[0028] Further, see Figure 9 and Figure 10 In some embodiments, the cover plate assembly 2 further includes a first plastic 26 and a second plastic 27, the first plastic 26 being connected to the first welding block 24 and the second plastic 27 being connected to the second welding block 25, so as to prevent the first welding block 24 and the second welding block 25 from short-circuiting with their corresponding first cover plate body 21 or second cover plate body 22.

[0029] In this embodiment, the electrode post 23 is sequentially disposed through its corresponding first welding block 24, first cover plate body 21 or second cover plate body 22, and second welding block 25 to achieve electrical connection with the electrode group 1 via the electrode tab. The first plastic 26 is disposed between the first welding block 24 and the corresponding first cover plate body 21 or second cover plate body 22, and the second plastic 27 is disposed between the second welding block 25 and the corresponding first cover plate body 21 or second cover plate body 22 to achieve an insulating connection between the first welding block 24, the second welding block 25 and the first cover plate body 21 or second cover plate body 22. The second plastic 27 disposed in the first assembly groove 12 is fitted to the first cover plate body 21. The snap-fit ​​part 211 is disposed away from the surface of the electrode group 1 and protrudes from the first welding block 24 in the first assembly groove 12. A sealing ring 231 is sleeved on the electrode post 23 to make the electrode post 23 and the corresponding first cover plate body 21 or second cover plate body 22 sealed together.

[0030] Thus, by setting the first welding blocks 24 on both sides of the protrusion 11, the space utilization of the cover plate assembly 2 can be improved. While increasing the battery capacity, it is also convenient to connect with other batteries or external circuits, making the battery structure more compact and improving the assembly ratio. The first plastic 26 and the second plastic 27 can improve the structural strength of the first cover plate body 21, thereby improving the connection strength between the first cover plate body 21 and the electrode group 1, and preventing the electrode group 1 from being damaged or shifting during the casing process.

[0031] It is understandable that the number and position of the first welding block 24 and the second welding block 25 can be adjusted according to the number and position of the pole post 23, which will not be elaborated here.

[0032] See Figure 4 In some embodiments, the first assembly groove 12 includes a first part 121 and a second part 122. The first part 121 is disposed at the end of the electrode group 1, and the second part 122 is disposed on the side of the electrode group 1 in the second direction Y. The first electrode tab 14 is disposed on the first part 121 and the second part 122.

[0033] In this embodiment, the first assembly groove 12 is an L-shaped groove, the second assembly groove 13 is a straight groove, and correspondingly, the first electrode tab 14 is L-shaped, the second electrode tab 15 extends along the first direction X, the electrode post 23 and the first welding block 24 are both disposed in the first part 121, and the second welding block 25 is L-shaped.

[0034] In this way, the first cover plate body 21 can be fitted to the end of the electrode group 1, improving the connection stability between the first cover plate body 21 and the electrode group 1, and making full use of the space at the end and side of the electrode group 1 to set the first tab 14 and the second tab 15, thereby improving the battery's overcurrent capacity. Setting the pole post 23 and the first welding block 24 in the first assembly groove 12 and the second assembly groove 13 can improve the protection effect on the pole post 23 and the first welding block 24, avoiding collisions and damage to the pole post 23 and the first welding block 24 during transportation, assembly and other processes, improving the structural strength and space utilization of the cover plate assembly 2, making the overall battery structure more compact, and increasing the assembly ratio.

[0035] It is understandable that the first assembly groove 12 can also be a straight groove. In this embodiment, the first assembly groove 12 is an L-shaped groove, which is to extend the length of the first electrode 14 and improve the current carrying capacity.

[0036] Furthermore, in some embodiments, the housing 3 is provided with a first reinforcing part 31 and a second reinforcing part 32 on the side of the housing 3 in the first direction X (that is, the large surface of the housing 3). The first reinforcing part 31 is provided at the position of the first mounting groove 12, and the second reinforcing part 32 is provided at the position of the second mounting groove 13. The shape of the first reinforcing part 31 is adapted to the shape of the first mounting groove 12. The second reinforcing part 32 is provided in the middle of the housing 3 and extends along the second direction Y to improve the structural strength of the positions of the first mounting groove 12 and the second mounting groove 13, and to improve the connection stability of the first cover plate body 21, the second cover plate body 22 and the housing 3, and to facilitate the flow of electrolyte in the housing 3.

[0037] See Figure 11 and Figure 12 In some embodiments, the first cover plate body 21 corresponds to the second part 122 (see...) Figure 4 A bending portion 212 is provided at the position of the first cover plate body 21. The width of the bending portion 212 along the second direction Y is L, and the thickness of the second welding block 25 is T2, satisfying 2.1mm≤L-T2≤20mm. Along the first direction X, the height of the first cover plate body 21 corresponding to the position of the first assembly groove 12 is H2, satisfying 20mm≤H2≤85mm.

[0038] In this embodiment, the difference between the width L of the bent portion 212 and the thickness T2 of the second welding block 25 can be any value between 2.1mm and 20mm or any range between any two values, such as 2.1mm, 5mm, 10mm, 15mm, 20mm, etc.; the height H2 of the first cover plate body 21 corresponding to the position of the first assembly groove 12 can be any value between 20mm and 85mm or any range between any two values, such as 20mm, 40mm, 60mm, 80mm, 85mm, etc.

[0039] In this way, the bent part 212 can fit snugly against the side of the electrode group 1 and connect with the first tab 14, thereby improving the battery's overcurrent capacity and the structural strength of the cover assembly 2. This allows the cover assembly 2 to be stably connected to the end and side of the electrode group 1, preventing damage and movement of the electrode group 1 during casing installation and preventing deformation of the cover assembly 2 under external force, thus improving battery safety.

[0040] Understandably, the difference between the width L of the bend 212 and the thickness T2 of the second welding block 25 cannot be too small. If it is too small, the width of the bend 212 will be insufficient, which will not be conducive to protecting the second welding plate. It will also make the structural strength of the bend 212 low, and the first cover plate body 21 will be prone to deformation. The difference between the width L of the bend 212 and the thickness T2 of the second welding block 25 cannot be too large either. If it is too large, it will increase the weight and processing cost of the first cover plate body 21, which will not be conducive to the assembly with the housing 3. The height H2 of the first cover plate body 21 corresponding to the position of the first assembly groove 12 cannot be too small. If it is too small, it will shorten the length of the first electrode 14 and affect the current carrying capacity. The height H2 of the first cover plate body 21 corresponding to the position of the first assembly groove 12 cannot be too large either. If it is too large, it will occupy more side space of the electrode group 1, which will not be conducive to processing and assembly.

[0041] See Figure 13 and Figure 14 In some embodiments, the first assembly slot 12 (see Figure 4 The area of ​​the pole post 23 away from the pole group 1 is S1, and the area of ​​the first welding block 24 away from the pole group 1 is S2, and 0.15≤S1 / S2≤0.33 is satisfied. Along the first direction X, the height of the snap-fit ​​part 211 protruding from the first welding block 24 is H1, and 5.5mm≤H1≤25mm is satisfied.

[0042] In this embodiment, see Figure 15 and Figure 16 The pole post 23 has an oblong structure, and the first welding block 24 has a rectangular structure. The first welding block 24 is welded to the pole post 23.

[0043] The ratio of the area S1 of the pole post 23 away from the pole group 1 in the first assembly groove 12 to the area S2 of the corresponding first welding block 24 away from the pole group 1 can be any value between 0.15 and 0.33 or any range between any two values, such as 0.15, 0.2, 0.25, 0.3, 0.33, etc.; the height H1 of the snap-fit ​​part 211 protruding from the first welding block 24 can be any value between 5.5mm and 25mm or any range between any two values, such as 5.5mm, 10mm, 15mm, 20mm, 25mm, etc.

[0044] This improves the battery's overcurrent capacity, facilitating electrical connections between multiple batteries via series, parallel, or series-parallel connections. Furthermore, the first welding block 24, positioned on both sides of the protrusion 11, fully utilizes the assembly space on both sides of the protrusion 11, enhancing assembly and electrical connection performance. This also makes the overall structure of the cover assembly 2 more compact, increasing the battery assembly ratio and grouping rate. The snap-fit ​​portion 211, protruding from the first welding block 24, enhances the protection of the first welding block 24 and the terminal post 23, preventing damage during transportation and assembly processes and improving battery safety.

[0045] Understandably, the ratio of the area S1 of the end of the pole post 23 away from the electrode group 1 in the first assembly groove 12 to the area S2 of the corresponding first welding block 24 away from the electrode group 1 cannot be too small. If it is too small, the pole post 23 will have insufficient current carrying capacity, affecting fast charging performance and reducing the connection strength between the pole post 23 and the first welding block 24. The ratio of the area S1 of the end of the pole post 23 away from the electrode group 1 in the first assembly groove 12 to the area S2 of the corresponding first welding block 24 away from the electrode group 1 cannot be too large either. If it is too large, the area of ​​the pole post 23 will be too large, reducing the welding area between the first welding block 24 and the pole post 23 and increasing the production cost of the cover plate assembly 2. The height H1 of the latching part 211 protruding from the first welding block 24 cannot be too small. If it is too small, it will reduce the protective effect of the latching part 211 on the pole post 23 and the first welding block 24. The height H1 of the latching part 211 protruding from the first welding block 24 cannot be too large either. If it is too large, it will increase the overall size of the battery and affect the space utilization rate.

[0046] See Figure 4 In some embodiments, the protrusion 11 includes an inclined surface 111, which is disposed on both sides of the protrusion 11 in the second direction Y. The length of the protrusion 11 on the side away from the electrode group 1 is less than its length on the side facing the electrode group 1. In this embodiment, the protrusion 11 is an isosceles trapezoidal structure, and the protrusions 11 of the two electrode groups 1 are symmetrically arranged.

[0047] This increases the assembly space on both sides of the protrusion 11, facilitating the assembly of the electrode post 23 and the first welding block 24, and enabling the battery to be electrically connected to other batteries or external circuits, thereby increasing the battery assembly ratio. When the first cover plate body 21 is assembled with the electrode group 1, the protrusion 11 can guide the assembly direction and achieve a quick connection with the snap-fit ​​part 211, improving assembly efficiency and the connection strength between the electrode group 1 and the first cover plate body 21, and making full use of the space at the end of the electrode group 1 to improve space utilization.

[0048] It is understandable that the protrusion 11 can also be a right trapezoid, rectangle, triangle or other shapes. The shape of the protrusion 11 can be adjusted according to actual needs, so as to achieve stable engagement with the latching part 211 while increasing the battery power. This will not be elaborated here.

[0049] See Figure 4 and Figure 12 In some embodiments, the thickness of the first cover plate body 21 is T1, and satisfies 1.5mm≤T1≤3mm. The included angle between the two inclined surfaces 111 of the first cover plate body 21 is N, and satisfies 60°≤N≤120°.

[0050] In this embodiment, the thickness T1 of the first cover plate body 21 can be any value between 1.5mm and 3mm or any range between any two values, such as 1.5mm, 2mm, 2.5mm, 3mm, etc.; the included angle N between the positions of the two inclined surfaces 111 corresponding to the first cover plate body 21 can be any value between 60° and 120° or any range between any two values, such as 60°, 80°, 100°, 120°, etc.

[0051] In this way, the first cover plate body 21 can have sufficient structural strength, improve the connection strength between the first cover plate body 21 and the electrode group 1, prevent the first cover plate body 21 from being deformed by external forces, and improve the protection effect on the electrode post 23 and the first welding block 24, preventing the electrode post 23 and the first welding block 24 from being bumped and damaged during transportation, assembly and other processes; by limiting the angle of the inclined surface 111, the assembly direction of the first cover plate body 21 can be guided during the assembly process, which facilitates the rapid positioning of the first cover plate body 21 and the electrode group 1 and improves the assembly efficiency.

[0052] Understandably, the thickness T1 of the first cover plate body 21 cannot be too small, otherwise the structural strength of the first cover plate body 21 will be poor and it will be easy to deform under external force. The thickness T1 of the first cover plate body 21 cannot be too large either, otherwise it will increase the production and processing cost and occupy more space at the end of the pole group 1. The included angle N of the first cover plate body 21 corresponding to the two inclined surfaces 111 cannot be too small, otherwise it will affect the assembly efficiency. The included angle N of the first cover plate body 21 corresponding to the two inclined surfaces 111 cannot be too large either, otherwise it will squeeze the assembly space on both sides of the protrusion 11, which is not conducive to the assembly of the pole post 23 and the first welding block 24.

[0053] See Figure 11 and Figure 12 In some embodiments, along the second direction Y, the snap-fit ​​portion 211 faces the pole group 1 (see...). Figure 4 The length of one side is W, the length of the first cover plate body 21 is A, and 0.35≤W / A≤0.6 is satisfied. Along the third direction Z, the width of the first cover plate body 21 is B, and 16mm≤B≤100mm is satisfied.

[0054] In this embodiment, the ratio of the length W of the snap-fit ​​portion 211 facing the pole group 1 to the length A of the first cover plate body 21 can be any value between 0.35 and 0.6 or any range between any two values, such as 0.35, 0.4, 0.5, 0.6, etc.; the width B of the first cover plate body 21 can be any value between 16mm and 100mm or any range between any two values, such as 16mm, 20mm, 40mm, 60mm, 80mm, 100mm, etc.

[0055] In this way, the snap-fit ​​portion 211 and the protrusion portion 11 can be fitted together, which improves the connection stability between the first cover plate body 21 and the electrode group 1, avoids damage and movement of the electrode group 1 when it is inserted into the shell, makes the cover plate assembly 2 more compact in size and makes full use of the space at the end of the electrode group 1; the protrusion portion 11, which is adapted to the shape of the snap-fit ​​portion 211, can improve the protection effect on the electrode post 23 and the first welding block 24, thereby improving the battery capacity and safety.

[0056] Understandably, the ratio of the length W of the latching part 211 facing the electrode group 1 to the length A of the first cover body 21 cannot be too small. If it is too small, the corresponding protrusion 11 will be too small, which is not conducive to the increase of power and the protection of the terminal post 23 and the first welding block 24. The ratio of the length W of the latching part 211 facing the electrode group 1 to the length A of the first cover body 21 cannot be too large either. If it is too large, it will squeeze the assembly space on both sides of the latching part 211 and affect the assembly of the terminal post 23 and the first welding block 24. The width B of the first cover body 21 cannot be too small, which will result in a small battery size. The width B of the first cover body 21 cannot be too large either, which will affect the space utilization of the battery.

[0057] See Figure 2 In some embodiments, the battery also includes an explosion-proof valve 4, which is disposed on the second cover body 22.

[0058] In this embodiment, two explosion-proof valves 4 are provided, and the two explosion-proof valves 4 are respectively located on both sides of the pole post 23 in the second assembly groove 13.

[0059] Thus, when the battery experiences thermal runaway, the generated gas can be quickly discharged to the outside through the explosion-proof valve 4 located on the side of the electrode assembly 1, improving the safety of the battery. By placing the explosion-proof valve 4 on the second cover body 22, the space on the second cover body 22 can be fully utilized, improving space utilization.

[0060] It is understandable that the explosion-proof valve 4 can also be installed on the first cover plate body 21. The number and installation position of the explosion-proof valve 4 can be adjusted according to actual needs, and will not be listed in detail here.

[0061] To verify the rationality of the following parameters: the ratio of the length W of the snap-fit ​​part 211 facing the pole group 1 to the length A of the first cover plate body 21; the difference between the width L of the bent part 212 and the thickness T2 of the second welding block 25; the height H1 of the snap-fit ​​part 211 protruding from the first welding block 24; the height H2 of the first cover plate body 21 corresponding to the position of the first assembly groove 12; the ratio of the area S1 of the pole post 23 in the first assembly groove 12 away from the pole group 1 to the area S2 of the corresponding first welding block 24 away from the pole group 1; the thickness T1 of the first cover plate body 21; the width B of the first cover plate body 21; and the range of the included angle N of the first cover plate body 21 corresponding to the positions of the two inclined surfaces 111, as shown in Table 1, this embodiment provides six sets of embodiments and six sets of comparative examples for illustration.

[0062] Table 1 As shown in Examples 1 to 6 of Table 1, after meeting the range limitations, the battery yield meets the requirements, and no abnormalities such as structural positioning deviations or poor structural strength are observed in the cover assembly 2, housing 3, etc. The cover assembly 2, electrode group 1, and electrode tabs are all undamaged and undeformed. The current carrying capacity and temperature of the cover assembly 2 meet the battery requirements.

[0063] As can be seen from Comparative Example 1, when the ratio of the length W of the snap-fit ​​part 211 facing the electrode group 1 to the length A of the first cover plate body 21 is too small, the battery yield does not meet the requirements. The length ratio of the protrusion 11 is insufficient, which reduces the size of the electrode group 1 and affects the capacity increase.

[0064] As shown in Comparative Example 2, when the ratio of the length W of the snap-fit ​​portion 211 facing the electrode group 1 to the length A of the first cover plate body 21 is too large, the battery yield does not meet the requirements. The length of the protrusion 11 is too large, occupying the space of the cover plate assemblies 2 on both sides. This affects the structural strength and current carrying capacity of the cover plate assembly 2.

[0065] As can be seen from Comparative Example 3, when the difference between the width L of the bending part 212 and the thickness T2 of the second welding block 25 is too small, the battery yield does not meet the requirements. The insufficient width of the bending part 212 reduces the protection level of components such as the second welding block 25. At the same time, the structural strength of the bending part 212 is insufficient and it is prone to deformation.

[0066] As can be seen from Comparative Example 4, when the difference between the width L of the bending part 212 and the thickness T2 of the second welding block 25 is too large, the battery yield does not meet the requirements. The excessive width of the bending part 212 increases the weight of the cover plate assembly 2 and the cost of processing and forming. At the same time, the welding tabs are not easy to operate.

[0067] As can be seen from Comparative Example 5, when the ratio of the area S1 of the pole post 23 away from the pole group 1 in the first assembly groove 12 to the area S2 of the corresponding first welding block 24 away from the pole group 1 is too small, the battery yield does not meet the requirements, the area ratio of the pole post 23 is insufficient, the current carrying capacity is insufficient, and the fast charging current carrying capacity cannot meet the fast charging current carrying capacity requirements, and the riveting strength of the cover plate assembly 2 is insufficient.

[0068] As can be seen from Comparative Example 6, when the ratio of the area S1 of the pole post 23 away from the pole group 1 in the first assembly groove 12 to the area S2 of the corresponding first welding block 24 away from the pole group 1 is too large, the battery yield does not meet the requirements. The area ratio of the pole post 23 is too large, which reduces the effective welding area of ​​the first welding block 24 at the corresponding position and cannot match the requirements of the battery plate welding. The size of the pole post 23 is too large, which increases the cost of the cover plate significantly.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery, characterized by, include: A pole assembly (1) is provided with a protrusion (11) at the end of the pole assembly (1) in the first direction (X). The pole assembly (1) is provided with a first mounting groove (12) and a second mounting groove (13). The first mounting groove (12) is provided at the end of the pole assembly (1), and the second mounting groove (13) is provided on the side of the pole assembly (1) in the second direction (Y). The pole assembly (1) is provided with a first electrode tab (14) and a second electrode tab (15). The first electrode tab (14) is provided in the first mounting groove (12), and the second electrode tab (15) is provided in the second mounting groove (13). The cover plate assembly (2) includes a first cover plate body (21), a second cover plate body (22), and a plurality of pole posts (23). The first cover plate body (21) is positioned corresponding to the first mounting groove (12), and the second cover plate body (22) is positioned corresponding to the second mounting groove (13). The pole posts (23) are electrically connected to the first electrode ear (14) and the second electrode ear (15) respectively. The first cover plate body (21) includes a snap-fit ​​part (211) that snaps into the protrusion (11). Along the first direction (X), the snap-fit ​​part (211) protrudes from the pole post (23) away from the surface of the pole group (1). The housing (3) is formed by the housing (3), the first cover plate body (21) and the second cover plate body (22) to form an accommodating space for accommodating the pole group (1), and the housing (3) protrudes from the pole post (23) along the second direction (Y); The first direction (X) is the thickness direction of the first cover plate body (21), and the second direction (Y) is the length direction of the first cover plate body (21).

2. The battery of claim 1, wherein, The cover plate assembly (2) further includes a first welding block (24) and a second welding block (25). The first welding block (24) and the second welding block (25) are both connected to the pole post (23). The first welding block (24) and the second welding block (25) are respectively disposed on both sides of the corresponding first cover plate body (21) or the second cover plate body (22). The second welding block (25) is connected to the corresponding first pole tab (14) or the second pole tab (15).

3. The battery of claim 2, wherein, The first assembly groove (12) includes a first part (121) and a second part (122). The first part (121) is disposed at the end of the pole group (1), and the second part (122) is disposed on the side of the pole group (1) in the second direction (Y). The first electrode tab (14) is disposed on the first part (121) and the second part (122).

4. The battery of claim 3, wherein, The first cover plate body (21) is provided with a bent portion (212) at the position corresponding to the second part (122). Along the second direction (Y), the width of the bent portion (212) is L, the thickness of the second welding block (25) is T2, and the condition 2.1mm≤L-T2≤20mm is satisfied; and / or, along the first direction (X), the height of the first cover plate body (21) corresponding to the position of the first assembly groove (12) is H2, and the condition 20mm≤H2≤85mm is satisfied.

5. The battery of claim 2, wherein, The area of ​​the pole post (23) in the first assembly groove (12) away from the pole group (1) is S1, and the area of ​​the first welding block (24) away from the pole group (1) is S2, and 0.15≤S1 / S2≤0.33 is satisfied; and / or, along the first direction (X), the height of the snap-fit ​​part (211) protruding from the first welding block (24) is H1, and 5.5mm≤H1≤25mm is satisfied.

6. The battery of claim 2, wherein, The cover plate assembly (2) further includes a first plastic (26) and a second plastic (27), the first plastic (26) being connected to the first welding block (24) and the second plastic (27) being connected to the second welding block (25).

7. The battery of claim 1, wherein, The protrusion (11) includes an inclined surface (111) which is disposed on both sides of the protrusion (11) in the second direction (Y). The length of the protrusion (11) on the side away from the pole group (1) is less than its length on the side facing the pole group (1).

8. The battery of claim 7, wherein, The thickness of the first cover plate body (21) is T1, and satisfies 1.5mm≤T1≤3mm; and / or, the included angle between the positions of the first cover plate body (21) and the two inclined surfaces (111) is N, and satisfies 60°≤N≤120°.

9. The battery according to any one of claims 1 to 8, characterized in that, Along the second direction (Y), the length of the snap-fit ​​portion (211) toward the pole group (1) is W, the length of the first cover plate body (21) is A, and 0.35≤W / A≤0.6 is satisfied; and / or, along the third direction (Z), the width of the first cover plate body (21) is B, and 16mm≤B≤100mm is satisfied.

10. The battery of any one of claims 1-8, wherein, The battery also includes an explosion-proof valve (4), which is disposed on the second cover plate body (22).

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