battery

Abstract

The application relates to the technical field of power batteries, and provides a battery. The battery provided by the application comprises a shell, a pole group arranged in the shell, and a cover plate assembly. The cover plate assembly comprises a cover plate, a lower plastic arranged on a first side of the cover plate in a thickness direction, a pole post arranged on the lower plastic and the cover plate, and a connecting sheet connected with the pole post and the pole lug of two pole groups at two ends. The lower plastic comprises a body part conforming to the cover plate and a folding part capable of being folded relative to the body part. The battery provided by the application is characterized in that the folding part is arranged so that the folded folding part can abut between the connecting sheet and the pole group, thereby separating the pole post, the connecting sheet and the pole group and playing a protection role on the pole group. Meanwhile, after being folded, the folding part is beneficial to abutting with the pole group, thereby effectively preventing the pole group from shaking in the shell, improving the fixing effect on the pole group, and having a good protection effect on the pole group, and further improving the safety performance of the battery.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery. Background Technology

[0002] Currently, batteries typically consist of a casing, a cover, and electrode assemblies housed within the casing. The cover has terminals for electrical connection with the tabs on the electrode assemblies. However, the contact area between the cover with the lower plastic layer and the electrode assemblies is relatively small, resulting in poor fixation of the electrode assemblies within the battery casing. Under conditions of vibration or external impact, the electrode assemblies are prone to shaking within the casing, leading to damage. Furthermore, the tabs are susceptible to tearing due to this shaking, potentially causing short circuits and posing a safety hazard. Utility Model Content

[0003] In view of this, this application aims to propose a battery to improve safety performance.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery includes a housing, two electrode groups arranged side by side within the housing, and a cover plate assembly disposed on the housing; The cover plate assembly includes a cover plate, a lower plastic disposed on the first side of the cover plate in the thickness direction, an electrode post passing through the lower plastic and the cover plate, and a connecting piece whose two ends are respectively connected to the electrode post and the two electrode groups. The lower plastic includes a body portion conforming to the cover plate and a folded portion that can be folded relative to the body portion, wherein the folded portion abuts between the connecting piece and the two electrode groups.

[0005] Furthermore, at least one side of the body portion in the width direction is provided with a support protrusion, the support protrusion protruding away from the cover plate; the support protrusion abuts against the pole group on the corresponding side.

[0006] Furthermore, both the cover plate and the main body are elongated strips, and the poles are two poles spaced apart along the length of the cover plate. The connecting pieces are corresponding to the poles one by one. The folded portions are two at both ends of the main body. The sum of the contact areas between the two folded portions and the support protrusion and the two pole groups, S1, and the sum of the areas of the end faces of the two pole groups with the tabs, S2, satisfy: 30%≤S1 / S2≤45%.

[0007] Furthermore, the pole post has a protruding section protruding to a second side in the thickness direction of the cover plate, the cover plate is formed with a boss protruding to a second side in the thickness direction of itself, and a groove is formed on a first side in the thickness direction of the cover plate; the boss is spaced apart from the pole post, and the protrusion height of the boss is greater than the protrusion height of the protruding section.

[0008] Furthermore, the lower plastic has a protrusion located within the groove, the protrusion being formed by the lower plastic itself, and a receiving groove for accommodating the electrode tab is formed on the lower plastic.

[0009] Furthermore, the connecting piece has a first portion connected to the pole post and a second portion for connecting to the tab of the pole assembly, the second portion being embedded in one of its receiving grooves.

[0010] Furthermore, the bosses are a plurality of those spaced apart on the cover plate, and the protrusions are arranged in a one-to-one correspondence with the bosses; One of the protrusions is provided with an injection hole, and corresponding to the injection hole, one of the protrusions is provided with an outlet hole, and the second part is provided with a clearance notch for avoiding the outlet hole; and / or, the cover plate is provided with an explosion-proof valve mounting hole, and at least one of the protrusions is provided between the explosion-proof valve mounting hole and the pole post, corresponding to the explosion-proof valve mounting hole, and the lower plastic is provided with a vent hole.

[0011] Furthermore, the cover plate assembly also includes an upper plastic material disposed on the second side of the cover plate in the thickness direction; the upper plastic material includes a main body and a separating rib disposed at the edge of the main body, the main body is provided with a through hole for the pole post to pass through, and the separating rib extends along the width direction of the cover plate.

[0012] Furthermore, the folding portion is integrally formed with the main body portion, and a glue-reducing groove is provided at the connection between the folding portion and the main body portion.

[0013] Furthermore, the end of the folded portion that connects to the main body portion is provided with a notch, and the notch extends along the width direction of the main body portion.

[0014] Compared with related technologies, this application has the following advantages: (1) The battery described in this application uses a connecting piece to facilitate the connection between the tab and the terminal post, ensuring the reliability of the battery's power output. Simultaneously, the folded portion on the lower plastic allows the folded portion to abut against the connecting piece and the electrode assembly, separating the terminal post, connecting piece, and electrode assembly to protect the electrode assembly. Furthermore, the folded portion reduces the gap between the lower plastic and the electrode assembly after folding, facilitating contact between the folded portion and the electrode assembly, effectively preventing the electrode assembly from shaking within the casing. This improves the fixation of the electrode assembly while also providing better protection, thereby enhancing the battery's safety performance.

[0015] (2) By setting the support protrusion, the support protrusion can abut against the side of the electrode assembly facing the lower plastic together with the folded part after folding, thereby forming a support for the electrode assembly and ensuring that the end of the electrode assembly with the tab is evenly stressed. This can improve the fixing effect of the electrode assembly in the housing, prevent the electrode assembly from shaking in the housing, prevent the tab from tearing or short-circuiting, and prevent the electrode assembly itself from being damaged by bumps in the housing, thereby improving the safety performance of the battery.

[0016] (3) By configuring the poles and folding parts as two separate units located at both ends of the main body, the two poles and two folding parts can be matched with the setting positions of the positive and negative terminals of the battery. At the same time, by setting the ratio of the area of ​​the folding parts and the supporting protrusions abutting the electrode assembly to the area of ​​the electrode assembly end face, sufficient contact area between the lower plastic and the electrode assembly can be ensured, thereby ensuring the supporting effect of the lower plastic on the electrode assembly and further improving the installation stability of the electrode assembly in the housing.

[0017] (4) By setting a boss on the cover plate and making the protrusion height of the boss greater than the protrusion height of the pole, the boss can withstand the impact when the cover plate is subjected to external force, so as to avoid the pole being directly subjected to external force and causing damage to the tab and pole assembly, thereby reducing the risk of damage to the tab and pole and further improving the safety performance of the battery.

[0018] (5) The inclusion groove on the lower plastic provides space for the tabs, reducing the space occupied by the tabs between the lower plastic and the electrode assembly, thereby improving the utilization rate of the internal space of the casing and thus improving the battery capacity. In addition, the inclusion groove constitutes a limiting constraint on the tabs to prevent them from moving around freely in the casing and to avoid displacement and tearing damage.

[0019] (6) By embedding the second part of the connecting piece in the receiving groove, it not only limits the connection of the connecting piece and facilitates its connection with the terminal post, but also facilitates the connection between the connecting piece and the electrode tab, and also gives the connecting piece better structural strength. In addition, the second part being located in the receiving groove increases the distance between the second part and the electrode assembly, so that when the battery is subjected to external impact, the second part of the connecting piece is less likely to collide with the electrode assembly, further reducing the risk of damage to the electrode assembly.

[0020] (7) By placing the boss between the explosion-proof valve mounting hole and the terminal post, the hot gas discharged from the explosion-proof valve can be prevented from affecting the terminal post, thus achieving the function of thermoelectric separation and improving battery safety performance. Placing the liquid injection hole on the boss can effectively reduce the weakening of the cover plate structure strength due to the liquid injection hole, ensuring that the cover plate has sufficient structural strength.

[0021] (8) By setting the upper plastic isolation rib, an insulation structure is formed between the pole and the cover plate, so as to improve the insulation effect between the pole and the overcurrent components connected on the pole and the cover plate, thereby reducing the risk of pole leakage or short circuit.

[0022] (9) By setting the glue-reducing groove, the material thickness at the connection between the folding part and the main body can be reduced, making it easier for the folding part to fold relative to the main body. This ensures the connection effect between the folding part and the main body while facilitating the battery assembly operation.

[0023] (10) By setting the notch, the width of the connection between the folding part and the main body can be reduced, further reducing the resistance of the folding part, making it easier for the folding part to fold relative to the main body, thereby facilitating the battery assembly operation. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the battery described in the embodiments of this application; Figure 2 for Figure 1 A sectional view at the location shown in AA; Figure 3 for Figure 2 Enlarged view of point C in the middle; Figure 4 for Figure 2 Enlarged view of point D in the middle; Figure 5 for Figure 1 A cross-sectional view at the location shown in BB; Figure 6 This is a schematic diagram of the structure when the electrode assembly and the cover plate assembly are connected according to an embodiment of this application; Figure 7 This is a top view of the electrode assembly and cover plate assembly as described in the embodiments of this application. Figure 8 This is a schematic diagram of the cover plate assembly described in an embodiment of this application; Figure 9 This is a structural schematic diagram of the cover plate assembly described in an embodiment of this application from another perspective; Figure 10 This is a top view of the cover plate assembly described in an embodiment of this application; Figure 11 This is a schematic diagram of the structure of the cover plate assembly described in this application when no connecting piece is provided; Figure 12 for Figure 8 Enlarged view at point E in the middle; Figure 13 for Figure 9 Enlarged view at point F; Figure 14 for Figure 9 Enlarged view of point G in the middle; Explanation of reference numerals in the attached figures: 1. Shell; 2. Electrode group; 201. Electrode tab; 3. Cover plate; 301. Pole post; 302. Boss; 3021. Injection hole; 303. Explosion-proof valve mounting hole; 4. Lower plastic part; 401. Main body; 4011. Support protrusion; 4012. Receiving groove; 4013. Liquid outlet hole; 4014. Liquid outlet groove; 402. Folding part; 403. Groove; 4031. Vent hole; 4032. Through hole; 4033. Connecting rib; 5. Connecting piece; 501. First part; 502. Second part; 5021. Avoidance notch; 6. Apply plastic; 601. Main body; 602. Separating ribs; 7. Glue Reduction Groove; 8. Gap. Detailed Implementation

[0025] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0027] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0029] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0031] An embodiment of the first aspect of this application provides a battery.

[0032] In related technologies, batteries typically consist of a casing 1, a cover plate 3, and an electrode assembly 2 disposed within the casing 1. The cover plate 3 has terminals 301 for electrical connection with tabs 201 on the electrode assembly 2. However, the contact area between the side of the cover plate 3 with the lower plastic 4 and the electrode assembly 2 is small, resulting in poor fixation of the electrode assembly 2 within the battery casing 1. Under conditions of battery vibration or impact, the electrode assembly 2 is prone to shaking within the casing 1, leading to damage. Furthermore, the tabs 201 are easily torn due to the shaking of the electrode assembly 2, posing a safety hazard.

[0033] In view of this, in order to overcome the shortcomings of related technologies, the battery in this embodiment combines... Figure 1 , Figure 2 and Figure 5 As shown, the overall design includes a housing 1, an electrode assembly 2, and a cover plate 3 assembly disposed on the housing 1.

[0034] The electrode groups 2 are configured as two arranged side-by-side within the housing 1. The cover plate 3 assembly includes a cover plate 3, a lower plastic 4 disposed on a first side in the thickness direction of the cover plate 3, an electrode post 301 passing through the lower plastic 4 and the cover plate 3, and a connecting piece 5 whose two ends are respectively connected to the electrode post 301 and the electrode tabs 201 of the two electrode groups 2. The lower plastic 4 includes a body portion 401 conforming to the cover plate 3, and a folding portion 402 capable of folding relative to the body portion 401, wherein the folded portion 402 abuts against the connecting piece 5 and the two electrode groups 2.

[0035] Therefore, the connecting piece 5 facilitates the connection between the tab 201 and the terminal post 301, ensuring the reliability of the battery's power output. Simultaneously, the folded portion 402 on the lower plastic 4 allows the folded portion 402 to abut against the connecting piece 5 and the electrode assembly 2, separating the terminal post 301, connecting piece 5, and electrode assembly 2 to protect the electrode assembly 2. Furthermore, the folded portion 402 reduces the gap between the lower plastic 4 and the electrode assembly 2 after folding, facilitating contact between the folded portion 402 and the electrode assembly 2. This effectively prevents the electrode assembly 2 from shifting within the casing 1, thus improving both the fixation and protection of the electrode assembly 2, thereby enhancing the battery's safety performance.

[0036] Based on the above overall introduction, specifically, combined with Figure 3 As shown, in some exemplary embodiments, the pole post 301 has a protruding section protruding to a second side in the thickness direction of the cover plate 3, and the cover plate 3 is formed with a boss 302 protruding to a second side in the thickness direction of itself, and a groove 403 is formed on a first side in the thickness direction of the cover plate 3. The boss 302 is spaced apart from the pole post 301, and the protrusion height of the boss 302 is greater than the protrusion height of the protruding section.

[0037] By providing a protrusion 302 on the cover plate 3 and making the protrusion height of the protrusion 302 greater than the protrusion height of the terminal post 301, the protrusion 302 can withstand the impact when the cover plate 3 is subjected to external force, thereby avoiding the terminal post 301 from being directly subjected to external force impact and causing damage to the tab 201 and the electrode group 2, thus reducing the risk of damage to the tab 201 and the terminal post 301 and further improving the safety performance of the battery.

[0038] In specific implementation, the distance d between the top of the boss 302 and the top of the protruding section of the pole post 301 satisfies: 1.0mm≤d≤2.0mm. Specifically, the height difference d between the top of the boss 201 and the top of the pole post 3 is 1.0mm, 1.2mm, 1.5mm, 1.7mm or 2.0mm, etc., to ensure the protective effect of the boss 302 on the pole post 301.

[0039] In some of the exemplary implementations, combined with Figure 9 , Figure 11 As shown, the lower plastic 4 has a protrusion located in the groove 403. The protrusion is formed by the lower plastic 4 itself, and a receiving groove 4012 for accommodating the tab 201 is formed on the lower plastic 4.

[0040] The inclusion groove 4012 on the lower plastic 4 provides storage space for the tab 201, reducing the space occupied by the tab 201 between the lower plastic 4 and the electrode assembly 2. This improves the utilization rate of the internal space of the casing 1, thereby increasing the battery capacity. Furthermore, the inclusion groove 4012 provides a limiting constraint on the tab 201, preventing it from moving freely within the casing 1 and avoiding displacement and tearing damage.

[0041] Combination Figure 9 As shown, in some exemplary embodiments, the connecting piece 5 has a first portion 501 connected to the pole post 301, and a second portion 502 for connecting to the pole tab 201 of the pole group 2, the second portion 502 being embedded in a receiving groove 4012 therein.

[0042] By embedding the second part 502 of the connecting piece 5 into the receiving groove 4012, the connecting piece 5 can not only be positioned to facilitate its connection with the terminal post 301, but also facilitate its connection with the tab 201, thus giving the connecting piece 5 better structural strength. Furthermore, the second part 502 being located in the receiving groove 4012 increases the distance between the second part 502 and the electrode assembly 2, making it less likely for the second part 502 of the connecting piece 5 to collide with the electrode assembly 2 when the battery is subjected to external impact, further reducing the risk of damage to the electrode assembly 2.

[0043] Combination Figure 4 , Figure 8 , Figure 9 and Figure 12As shown, in some exemplary embodiments, there are multiple bosses 302 spaced apart on the cover plate 3, with each boss 302 corresponding to a protrusion. One boss 302 has an injection hole 3021, and corresponding to the injection hole 3021, another protrusion has an outlet hole 4013. The second part 502 has an avoidance notch 5021 to avoid the outlet hole 4013. By placing the bosses 302 between the explosion-proof valve mounting hole 303 and the terminal post 301, the hot gas discharged from the explosion-proof valve can be prevented from affecting the terminal post 301, thus achieving the function of thermoelectric separation and improving battery safety performance.

[0044] In a specific implementation, a liquid outlet groove 4014 is provided on the protrusion of the boss 302 corresponding to the liquid injection hole 3021. The liquid outlet groove 4014 is formed by the lower plastic 4 recessed towards the side away from the cover plate 3. The liquid outlet hole 4013 is provided on the side wall of the liquid outlet groove 203, and the projections of the liquid injection hole 3021 and the liquid outlet hole 4013 in the thickness direction of the cover plate 3 are staggered.

[0045] In some exemplary embodiments, the cover plate 3 is provided with an explosion-proof valve mounting hole 303, and at least one boss 302 is provided between the explosion-proof valve mounting hole 303 and the pole post 301. Corresponding to the explosion-proof valve mounting hole 303, the lower plastic 4 is provided with a vent hole 4031. By providing the injection hole 3021 on the boss 302, the weakening effect of the injection hole 3021 on the structural strength of the cover plate 3 can be effectively reduced, ensuring that the cover plate 3 has sufficient structural strength.

[0046] In specific implementation, combined with Figure 9 , Figure 14 As shown, in this embodiment, the lower plastic 4 is recessed into the side where the electrode assembly 2 is located, corresponding to the position of the explosion-proof valve mounting hole 303, to form a groove 403, thereby providing sufficient installation space for the explosion-proof valve. Based on this, in this embodiment, a vent hole 4031 is provided at the bottom of the groove 403.

[0047] Furthermore, the bottom of the aforementioned groove 403 is provided with multiple spaced through holes 4032. These through holes 4032 are arranged in an elongated shape around the vent hole 4031, and a connecting rib 4033 is formed between adjacent through holes 4032. This divides the bottom of the groove 403 into two parts, which are connected only by the connecting rib 4033. Thus, when thermal runaway occurs in the electrode assembly 2 and a large amount of gas is rapidly generated inside the battery casing 1, the gas inside the casing 1 can push against the bottom of the groove 403. The high temperature of the gas can also melt and break the connecting rib 4033, causing the portion of the groove 403 with the vent hole 4031 to detach. This effectively enlarges the diameter of the vent hole 4031, thereby facilitating the discharge of gas and preventing the battery from exploding.

[0048] Combination Figure 7As shown, in some exemplary embodiments, at least one side of the body portion 401 in the width direction is provided with a support protrusion 4011, which protrudes away from the cover plate 3. The support protrusion 4011 abuts against the pole group 2 on the corresponding side.

[0049] By setting the support protrusion 4011, the support protrusion 4011 can abut against the side of the electrode assembly 2 facing the lower plastic 4 together with the folded part 402 after folding, thereby forming a support for the electrode assembly 2 and ensuring that the end of the electrode assembly 2 with the tab 201 is evenly stressed. This can improve the fixing effect of the electrode assembly 2 in the housing 1, prevent the electrode assembly 2 from shaking in the housing 1, prevent the tab 201 from tearing or short-circuiting, and prevent the electrode assembly 2 itself from being damaged by bumps in the housing 1, thereby improving the safety performance of the battery.

[0050] In specific implementation, the support components of this embodiment are configured as multiple. Among them, the folding portion 402 is provided with support protrusions 4011 on both sides in the width direction. After the folding portion 402 is folded into place, the two support protrusions 4011 on both sides of the folding portion 402 can form a limiting constraint on the folding portion 402 to prevent the folding portion 402 from shifting in the width direction.

[0051] In addition, in this embodiment, the groove 403 is provided with support protrusions 4011 on both sides in the width direction. The support protrusions 4011 are provided on the side of the lower plastic 4 facing the electrode group 2, thereby ensuring the support effect of the electrode group 2 in the area where the groove 403 is located.

[0052] In some exemplary embodiments, both the cover plate 3 and the body portion 401 are elongated strips. Two pole posts 301 are spaced apart along the length of the cover plate 3, and connecting pieces 5 are correspondingly arranged one-to-one with each pole post 301. Two folding portions 402 are located at both ends of the body portion 401 along its length. The sum of the contact areas S1 between the two folding portions 402 and the supporting protrusions 4011 and the two pole groups 2, and the sum of the areas S2 of the end faces of the two pole groups 2 with the pole ears 201, satisfy: 30% ≤ S1 / S2 ≤ 45%.

[0053] By configuring the terminal posts 301 and the folding portions 402 as two separate units located at both ends of the main body, the two terminal posts 301 and the two folding portions 402 can be matched to the positions of the positive and negative terminals of the battery. Simultaneously, by setting the ratio of the area of ​​the folding portion 402 and the support protrusion 4011 abutting against the electrode assembly 2 to the end face area of ​​the electrode assembly 2, sufficient contact area between the lower plastic 4 and the electrode assembly 2 can be ensured, thereby ensuring the supporting effect of the lower plastic 4 on the electrode assembly 2 and further improving the installation stability of the electrode assembly 2 within the housing 1.

[0054] In practical implementation, the sum of the contact areas S1 between the two folding portions 402 and the supporting protrusion 4011 and the two pole groups 2 in this embodiment satisfies: 3000mm. 2 ≤S1≤7000mm 2 And the sum of the areas S2 of the end faces of the two pole groups 2 with pole tabs 201 at one end satisfies: 10400mm 2 ≤S1≤15500mm 2 Furthermore, in this embodiment, the sum of the areas S3 of the welding regions of the tabs 201 and the connecting pieces 5, and the sum of the areas S4 of each tab 201, satisfy: 11% ≤ S3 / S4 ≤ 18%, 200mm 2 ≤S3≤550mm 2 1800mm 2 ≤S4≤3100mm 2 This is to ensure the welding strength between the tab 201 and the connecting piece 5.

[0055] To verify the rationality of the selection of the sum of the contact areas between the two pole groups 2, S1; the sum of the areas of the end faces of the two pole groups 2 with the tabs 201, S2; the sum of the areas of the welding areas of the tabs 201 and the connecting piece 5, S3; and the sum of the areas of each tab 201, S4, in this embodiment, the verification is shown in the table.

[0056] Table 1

[0057] As shown in Table 1, this embodiment ensures sufficient contact area between the electrode group 2 and the lower plastic 4 by selecting the sum of the contact areas S1 between the two electrode groups 2 and the sum of the areas S2 of the end faces of the two electrode groups 2 with the electrode tabs 201, thereby ensuring the fixing effect of the lower plastic 4 on the electrode group 2. Simultaneously, this embodiment ensures the welding effect of the electrode tabs 201 by selecting the sum of the areas S3 of the welding areas between the electrode tabs 201 and the connecting piece 5, and the sum of the areas S4 of each electrode tab 201.

[0058] In addition, when the tab 201 of this embodiment is welded to the connecting piece 5, the minimum penetration depth of the tab 201 should be greater than or equal to 100 μm, and the maximum penetration depth of the tab 201 should be 60% of the thickness of the tab 201, so that the welding tensile stress between the tab 201 and the connecting piece 5 is greater than or equal to 50 N, so as to further ensure the welding strength between the tab 201 and the connecting piece 5.

[0059] Combination Figure 1 , Figure 8As shown, in some exemplary embodiments, the cover plate 3 assembly further includes an upper plastic 6 disposed on the second side of the cover plate 3 in the thickness direction. The upper plastic 6 includes a body 601 and a separating rib 602 disposed at the edge of the body 601. The body 601 has a through hole for the pole post 301 to pass through, and the separating rib 602 extends along the width direction of the cover plate 3.

[0060] The insulating structure between the pole post 301 and the cover plate 3 is formed by the setting of the insulating rib 602 on the upper plastic 6, so as to improve the insulation effect between the pole post 301 and the overcurrent component connected on the pole post 301 and the cover plate 3, thereby reducing the risk of leakage or short circuit of the pole post 301.

[0061] In specific implementation, the isolation rib 602 of this embodiment is provided on the side of the main body 601 facing the boss 302 to ensure the insulation performance between the pole post 301 and the boss 302.

[0062] Combination Figure 12 As shown, in some exemplary embodiments, the folding portion 402 is integrally formed with the body portion 401, and a glue-reducing groove 7 is provided at the connection between the folding portion 402 and the body portion 401.

[0063] By setting the adhesive reduction groove 7, the material thickness at the connection between the folding part 402 and the main body part 401 can be reduced, making it easier for the folding part 402 to fold relative to the main body part 401. This ensures the connection effect between the folding part 402 and the main body part 401 while facilitating the battery assembly operation.

[0064] Furthermore, in some exemplary embodiments, the end of the folding portion 402 connected to the body portion 401 is provided with a notch 8, which extends along the width direction of the body portion 401.

[0065] By setting the notch 8, the width of the connection between the folding part 402 and the main body part 401 can be reduced, further reducing the resistance of folding the folding part 402, making it easier for the folding part 402 to fold relative to the main body part 401, thereby facilitating the battery assembly operation.

[0066] It is worth noting that, regarding the battery in this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still made of... Figures 1 to 14 The device includes a housing 1, two pole groups 2 arranged side by side inside the housing 1, and a cover plate 3 assembly disposed on the housing 1.

[0067] The cover plate 3 assembly includes a cover plate 3, a lower plastic 4 disposed on a first side in the thickness direction of the cover plate 3, an electrode post 301 passing through the lower plastic 4 and the cover plate 3, and a connecting piece 5 whose two ends are respectively connected to the electrode post 301 and the electrode tabs 201 of the two electrode groups 2. The lower plastic 4 includes a body portion 401 conforming to the cover plate 3, and a folding portion 402 that can be folded relative to the body portion 401, and the folded portion 402 abuts between the connecting piece 5 and the two electrode groups 2 after folding.

[0068] In addition, support protrusions 4011 are provided on both sides of the main body 401 in the width direction. The support protrusions 4011 protrude away from the cover plate 3 and abut against the corresponding pole group 2. Both the cover plate 3 and the main body 401 are elongated. There are two pole posts 301 spaced apart along the length direction of the cover plate 3. The connecting piece 5 is provided in a one-to-one correspondence with the pole post 301. There are two folded portions 402 at both ends of the main body 401 in the length direction. The sum of the abutment areas S1 between the two folded portions 402 and the support protrusions 4011 and the two pole groups 2, and the sum of the areas S2 of the end faces of the two pole groups 2 with the pole ears 201, satisfy: 30%≤S1 / S2≤45%.

[0069] Additionally, the electrode post 301 has a protruding section extending towards a second side in the thickness direction of the cover plate 3. The cover plate 3 has a boss 302 protruding towards its own thickness direction on a second side, and a groove 403 is formed on a first side in the thickness direction of the cover plate 3. The boss 302 is spaced apart from the electrode post 301, and the protrusion height of the boss 302 is greater than the protrusion height of the protruding section. The lower plastic 4 has a protrusion located in the groove 403. The protrusion is formed by the lower plastic 4 itself, and a receiving groove 4012 for accommodating the electrode tab 201 is formed on the lower plastic 4.

[0070] Furthermore, the connecting piece 5 has a first portion 501 connected to the pole post 301, and a second portion 502 for connecting to the pole tab 201 of the pole assembly 2. The second portion 502 is embedded in a receiving groove 4012. Multiple bosses 302 are spaced apart on the cover plate 3, with each boss corresponding to a protrusion. One boss 302 has an injection hole 3021, and corresponding to the injection hole 3021, one protrusion has an outlet hole 4013. The second portion 502 has a clearance notch 5021 for avoiding the outlet hole 4013.

[0071] Furthermore, the cover plate 3 is provided with an explosion-proof valve mounting hole 303, and at least one boss 302 is provided between the explosion-proof valve mounting hole 303 and the pole post 301. Corresponding to the explosion-proof valve mounting hole 303, the lower plastic 4 is provided with a vent hole 4031. The cover plate 3 assembly also includes an upper plastic 6 provided on the second side in the thickness direction of the cover plate 3. The upper plastic 6 includes a main body 601 and an isolation rib 602 provided on the edge of the main body 601 facing the boss 302. The main body 601 is provided with a through hole for the pole post 301 to pass through, and the isolation rib 602 extends along the width direction of the cover plate 3.

[0072] Finally, the folded portion 402 is integrally formed with the main body portion 401, and a glue-reducing groove 7 is provided at the connection between the folded portion 402 and the main body portion 401. A notch 8 is provided at the end where the folded portion 402 is connected to the main body portion 401, and the notch 8 extends along the width direction of the main body portion 401.

[0073] In the preferred embodiment of the battery described above, the specific configuration and arrangement of the cover plate 3, the lower plastic 4, the connecting piece 5, etc. can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cover plate 3, the lower plastic 4, the connecting piece 5, etc. can also be referred to the descriptions in the above exemplary embodiments.

[0074] The battery in this embodiment adopts the above design. The connecting piece 5 facilitates the connection between the tab 201 and the terminal post 301, ensuring the reliability of the battery's power output. Simultaneously, the folded portion 402, after being folded, abuts against the connecting piece 5 and the electrode assembly 2, protecting the electrode assembly 2. Furthermore, the folded portion 402, after folding, facilitates contact between the folded portion 402 and the electrode assembly 2, effectively preventing the electrode assembly 2 from shifting within the casing 1. This improves the fixation of the electrode assembly 2 while also providing better protection, thereby enhancing the battery's safety performance.

[0075] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A battery, characterized in that: It includes a housing (1), two pole groups (2) arranged side by side inside the housing (1), and a cover plate (3) assembly disposed on the housing (1); The cover plate (3) assembly includes a cover plate (3), a lower plastic (4) disposed on the first side of the thickness direction of the cover plate (3), an electrode post (301) passing through the lower plastic (4) and the cover plate (3), and a connecting piece (5) whose two ends are respectively connected to the electrode post (301) and the electrode lugs (201) of the two electrode groups (2). The lower plastic (4) includes a body portion (401) conforming to the cover plate (3) and a folding portion (402) foldable relative to the body portion (401), wherein the folded portion (402) abuts between the connecting piece (5) and the two pole groups (2).

2. The battery according to claim 1, characterized in that: The body portion (401) has a support protrusion (4011) on at least one side in the width direction, and the support protrusion (4011) protrudes away from the cover plate (3); The support protrusion (4011) abuts against the pole group (2) on the corresponding side.

3. The battery according to claim 2, characterized in that: Both the cover plate (3) and the main body (401) are elongated strips. The pole post (301) consists of two pole posts spaced apart along the length of the cover plate (3). The connecting piece (5) is arranged in a one-to-one correspondence with the pole post (301). The folding portion (402) consists of two portions located at both ends of the body portion (401) along its length. The sum of the contact areas between the two folding portions (402) and the support protrusion (4011) and the two pole groups (2), S1, and the sum of the areas of the end faces of the two pole groups (2) with the pole ears (201) provided, S2, satisfy: 30%≤S1 / S2≤45%.

4. The battery according to claim 1, characterized in that: The pole post (301) has a protruding section that protrudes to the second side in the thickness direction of the cover plate (3), and the cover plate (3) is formed with a boss (302) that protrudes to the second side in the thickness direction of itself, and a groove (403) is formed on the first side in the thickness direction of the cover plate (3). The boss (302) is spaced apart from the pole post (301), and the protrusion height of the boss (302) is greater than the protrusion height of the protrusion segment.

5. The battery according to claim 4, characterized in that: The lower plastic (4) is provided with a protrusion located in the groove (403), the protrusion is formed by the lower plastic (4) itself, and a receiving groove (4012) for accommodating the tab (201) is formed on the lower plastic (4).

6. The battery according to claim 5, characterized in that: The connecting piece (5) has a first portion (501) connected to the pole post (301) and a second portion (502) for connecting to the tab (201) of the pole group (2), the second portion (502) being embedded in one of its receiving grooves (4012).

7. The battery according to claim 6, characterized in that: The bosses (302) are a plurality of them spaced apart on the cover plate (3), and the protrusions are provided one-to-one with the bosses (302); One of the bosses (302) is provided with an injection hole (3021), and corresponding to the injection hole (3021), one of the protrusions is provided with an outlet hole (4013), and the second part (502) is provided with an avoidance notch (5021) for avoiding the outlet hole (4013); and / or, the cover plate (3) is provided with an explosion-proof valve mounting hole (303), and at least one of the bosses (302) is provided between the explosion-proof valve mounting hole (303) and the pole post (301), corresponding to the explosion-proof valve mounting hole (303), and the lower plastic (4) is provided with a vent hole (4031).

8. The battery according to claim 1, characterized in that: The cover plate (3) assembly also includes an upper plastic (6) disposed on the second side in the thickness direction of the cover plate (3). The upper plastic (6) includes a main body (601) and an isolation rib (602) provided at the edge of the main body (601). The main body (601) has a through hole for the pole post (301) to pass through, and the isolation rib (602) extends along the width direction of the cover plate (3).

9. The battery according to any one of claims 1 to 8, characterized in that: The folding part (402) is integrally formed with the main body part (401), and a glue-reducing groove (7) is provided at the connection between the folding part (402) and the main body part (401).

10. The battery according to claim 9, characterized in that: The folded portion (402) is provided with a notch (8) at one end where it connects to the main body portion (401), and the notch (8) extends along the width direction of the main body portion (401).

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