Protective cushion block, protective structure and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a protective cushion block, a protective structure and a battery, the protective cushion block is arranged between two adjacent pole groups, a connecting gap is arranged between the two pole groups, tabs of the two pole groups are fixedly connected, the protective cushion block comprises a cushion block body, one cushion block body is arranged between the two adjacent pole groups, and the protective structure is arranged between the two adjacent pole groups. One end of the cushion block body is provided with a mounting groove for a tab to pass through, and the cushion block body is arranged in the connecting gap and is connected with the two pole groups. In this way, the tabs are located in the mounting grooves, the cushion block body can protect the tabs, the situation that the tabs are in lap joint in the assembling process of the pole sets, and consequently short circuit is caused is avoided, the safety and stability of the pole sets are improved, the cushion block body abuts against the two pole sets respectively, the width of the connecting gap can be kept unchanged, and the pole set assembling difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a protective cushion block, a protective structure and a battery. Background Art

[0002] A battery is a device that converts chemical energy into electrical energy. It generates an electric current through chemical reactions occurring inside. As a commonly used battery, a lithium-ion battery has characteristics such as high energy density, long service life, and low self-discharge rate. With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields.

[0003] A lithium-ion battery includes a pole group and a housing. The pole group is arranged inside the housing and combined to form an electric core. The pole group includes pole ears for delivering current to the outside.

[0004] In order to make the lithium-ion battery longer, multiple pole groups are usually assembled in series. However, the longer pole group is prone to bending deformation, resulting in a lower yield. Moreover, the support received by the pole group during assembly and moving into the housing is weak, which is not convenient for assembly. And when the longer pole group is in thermal runaway, due to the longer gas flow path, it is difficult to quickly release to the outside; when multiple pole groups are connected in series through pole ears, the pole ears need sufficient space for welding, but the pole ears are prone to bending and there is a risk of overlap during the movement of the pole group. The safety performance of multiple mutually connected longer pole groups is poor. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a protective cushion block, a protective structure and a battery to solve the problems of high assembly difficulty, poor stability and poor safety of the longer pole group.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] In a first aspect, a protective cushion block is arranged between two adjacent pole groups. There is a connection gap between the two pole groups, and the pole ears of the two pole groups are fixedly connected. The protective cushion block includes: a cushion block body. One cushion block body is arranged between two adjacent pole groups. One end of the cushion block body is provided with an installation groove for the pole ear to pass through. The cushion block body is arranged in the connection gap and connected to both of the two pole groups.

[0008] Preferably, the end of the cushion block body where the installation groove is opened is provided with a rounded corner.

[0009] Preferably, the length of the installation groove is not less than the length of the pole ear so that the pole ear is located inside the installation groove.

[0010] Preferably, the length of the protective cushion block is W, and the length of the tab is L, satisfying 2 mm < W - L; and / or, the minimum thickness of the installation groove is H, and the thickness dimension 2 mm < H < 5 mm.

[0011] In a second aspect, a protection structure includes side plates and the protective cushion block as described above. The side plates are connected to the electrode group. The side plates include second plates. The second plates are disposed in the connection gap. Two second plates are disposed in the same connection gap, and the two second plates are respectively disposed on both sides of the cushion block body.

[0012] Preferably, the sum of the length of the cushion block body and the lengths of the two second plates disposed at both ends of the cushion block body is equal to the length of the connection gap.

[0013] Preferably, the protection structure further includes an insulating film. The insulating film is disposed between the side plates and the electrode group, and the second plates pass through the insulating film.

[0014] In a third aspect, a battery is characterized by including an electrode group group, a housing, and the protection structure as described above. The electrode group group is disposed in the housing. The electrode group group includes at least two electrode groups. Tabs are respectively connected to both ends of the electrode groups. Two tabs at one ends of adjacent electrode groups close to each other are electrically connected and pass through the installation groove.

[0015] Preferably, an explosion-proof valve is disposed at a position of the housing corresponding to the second plate. The side plates include first plates. The first plates are connected to the second plates. An exhaust hole is formed at a position of the first plate close to the explosion-proof valve corresponding to the explosion-proof valve. An exhaust groove communicating with the exhaust hole is formed in the second plate connected to the first plate. The protection structure further includes an insulating film. A connection hole is formed in the insulating film. The second plate passes through the connection hole and is located in the connection gap.

[0016] Preferably, a positive electrode cover plate and a negative electrode cover plate are connected to the housing. The positive electrode cover plate and the negative electrode cover plate are respectively disposed at both ends of the electrode group group. The protection structure further includes a support plate. The support plate is connected to at least one of the positive electrode cover plate and the negative electrode cover plate.

[0017] Advantages of the present utility model:

[0018] A protective cushion block is disposed between two adjacent electrode groups. There is a connection gap between the two electrode groups. The tabs of the two electrode groups are fixedly connected. The protective cushion block includes a cushion block body. One cushion block body is disposed between two adjacent electrode groups. An installation groove for the tab to pass through is formed at one end of the cushion block body. The cushion block body is disposed in the connection gap and is connected to both electrode groups.

[0019] In this way, the two electrode groups are connected through the tab, which can simplify the process, reduce the internal resistance, decrease the length of a single electrode group and the space occupied inside the electrode group, avoid defects such as wrinkles, deformation, delamination, and fracture of the electrode group caused by the excessive length of the electrode group, and ensure the stable connection between the electrode groups while the length of the electrode group is relatively long. The cushion block body is assembled on the tab and the tab is located in the installation groove, which can protect the tab by the cushion block body, avoid the overlap between the tabs during the assembly of the electrode group and cause a short circuit. The cushion block body abuts against the side walls of two adjacent electrode groups that are close to each other, which can keep the width of the connection gap unchanged, avoid damage to the tabs during assembly, reduce the assembly difficulty of the electrode group, and improve the safety and stability of the electrode group. Description of the Drawings

[0020] Figure 1 is a schematic structural view of the protective cushion block in an embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of the protective structure in an embodiment of the present invention;

[0022] Figure 3 is a schematic partial structural view of the protective structure in an embodiment of the present invention;

[0023] Figure 4 is a schematic partial structural view of the battery in an embodiment of the present invention;

[0024] Figure 5 is a schematic structural view of the battery in an embodiment of the present invention;

[0025] Figure 6 is a schematic internal structural view of the battery in an embodiment of the present invention;

[0026] Figure 7 is a cross-sectional view of the battery in an embodiment of the present invention;

[0027] Figure 8 is a schematic structural view of the positive electrode cover plate and the insulating sticker.

[0028] In the figure:

[0029] 1. Cushion block body; 11. Installation groove; 2. Side plate; 21. First plate; 211. Exhaust hole; 22. Second plate; 221. Exhaust groove; 3. Insulating film; 31. Connection hole; 4. Support plate; 41. Limiting groove; 5. Electrode group; 51. Tab; 6. Connection gap; 7. Housing; 71. Explosion-proof valve; 72. Positive electrode cover plate; 73. Negative electrode cover plate; 8. Insulating sticker; 81. First hole; 82. Second hole. Detailed Embodiment

[0030] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] Refer to Figures 1 - 4 , the present utility model provides a protective cushion block, which is arranged between two adjacent pole groups 5. There is a connection gap 6 between the two pole groups 5 (refer to Figure 6 ), that is, the two pole groups 5 are arranged at intervals, and the pole lugs 51 of the two pole groups 5 are fixedly connected. The protective cushion block includes a cushion block body 1. One cushion block body 1 is arranged between two adjacent pole groups 5. One end of the cushion block body 1 is provided with an installation groove 11 for the pole lug 51 to pass through. The cushion block body 1 is arranged in the connection gap 6 and is connected to both pole groups 5.

[0035] In this embodiment, the tabs 51 at one end where two pole groups 5 are close to each other are fixedly connected by horizontal welding to achieve the series connection of the two pole groups 5. The length direction of the connection gap 6 is parallel to the height direction of the pole group 5. The pad body 1 is inserted on the tabs 51 at one end where two pole groups 5 are close to each other. The length direction of the installation groove 11 is parallel to the length direction of the connection gap 6. The axis of the installation groove 11 coincides with the axis of the pad body 1 in the length direction. The length of the pad body 1 in the length direction of the pole group 5 is equal to the width of the connection gap 6. That is, when the pad body 1 is assembled onto the tab 51, the side walls of the pad body 1 are respectively abutted against the side walls of the two pole groups 5 that are close to each other.

[0036] In this way, connecting the two pole groups 5 by welding the tabs 51 can not only simplify the process and reduce the internal resistance, but also extend the length of the pole group by connecting multiple pole groups 5, thereby reducing the length of a single pole group 5 and the internal space of the pole group 5 to avoid defects such as wrinkles, deformations, layer displacement, and fractures of the pole group due to the excessive length of the pole group 5, ensuring the stable connection of the pole group 5 while having a relatively long length of the pole group. After the two pole groups 5 are connected by the tabs 51, inserting the pad body 1 onto the tab 51 and placing the tab 51 in the installation groove 11 can protect the tab 51 by the pad body 1, preventing the tabs 51 from overlapping and causing a short circuit during the assembly process of the pole group 5, improving the stability and safety of the pole group 5. At the same time, the pad body 1 is respectively abutted against the two pole groups 5, which can keep the width of the connection gap 6 (that is, the distance between the two pole groups 5) unchanged, facilitating the assembly of the pole group into the housing 7, avoiding the relative position of the two pole groups 5 from changing and causing damage or bending of the tabs 51, improving the connection strength of the tabs 51, reducing the assembly difficulty of the pole group 5, and maintaining a relatively long overall length of the pole group.

[0037] It can be understood that after the pad body 1 is assembled onto the tab 51, it can also be fixed to the side wall of the pole group 5 by means of adhesion or the like to further limit the position of the pad body 1, not limited to plugging. The connection method between the pad body 1 and the tab 51 can be flexibly adjusted according to actual needs as long as it can provide protection for the tab 51, and no more examples are listed here.

[0038] Refer to Figure 1 , in some embodiments, one end of the pad body 1 where the installation groove 11 is opened is provided with a rounded corner.

[0039] In this embodiment, the pad body 1 is symmetrically arranged with its length direction as the axis. That is, the pad body 1 has a U-shaped structure, and one end of the pad body 1 where the installation groove 11 is opened is provided with an inward rounded corner towards the axis in the length direction of the pad body 1.

[0040] In this way, during the process of assembling the spacer body 1 to the tab 51, it is not easy to damage the tab 51, and at the same time, it is convenient for the staff to quickly insert the spacer body 1 onto the tab 51, reducing the assembly difficulty, improving the connection strength and service life of the tab 51, and further improving the connection strength and stability of two adjacent pole groups 5.

[0041] It can be understood that one end of the spacer body 1 where the installation groove 11 is opened can also be set at a right angle or an oblique angle, not limited to the rounded corner setting. The position of the installation groove 11 opened on the spacer body 1 and the shape of one end where the installation groove 11 is opened can be flexibly adjusted, and this embodiment does not make any limitations in this regard.

[0042] Refer to Figure 2 , in some embodiments, the length of the installation groove 11 is not less than the length of the tab 51, so that the tab 51 is located inside the installation groove 11. In this embodiment, the length of the installation groove 11 is greater than the length of the tab 51.

[0043] In this way, the tab 51 can be completely located inside the installation groove 11 and protected by the spacer body 1, improving the connection strength of the tab 51, and further improving the connection strength between two adjacent pole groups 5.

[0044] Refer to Figure 2 , in some embodiments, the length of the protective spacer is W, the length of the tab 51 is L, satisfying 2mm < W - L; the minimum thickness of the installation groove 11 is H, and the thickness dimension is 2mm < H < 5mm. Exemplarily, the difference between the length W of the protective spacer and the length L of the tab 51 can be 2.1mm, 2.5mm, 3mm, and the thickness H of the installation groove 11 can be 2.1mm, 2.5m, 3mm, 3.5mm, 4mm, 4.9mm.

[0045] In this way, there is sufficient installation space for the tabs 51 to be welded to each other, facilitating the insertion of the tabs 51 into the installation groove 11, reducing the assembly difficulty, avoiding deformation of the tabs 51 due to the narrow space between the installation groove 11 and the tabs 51, and when the pole group 5 gets out of control, gas can flow in the installation groove 11, improving the exhaust efficiency, and further improving the stability and safety of the pole group with a longer length.

[0046] It can be understood that the length W of the protective spacer, the length L of the tab 51, and the thickness H of the installation groove 11 can all be adjusted according to actual design needs, and no more examples are listed here.

[0047] Refer to Figure 3 and Figure 4, the present utility model also provides a protection structure, including a side plate 2 and a protection cushion block. The side plate 2 is connected to the pole group 5. The side plate 2 includes a second plate 22. The second plate 22 is arranged in the connection gap 6. Two second plates 22 are arranged in the same connection gap 6, and the two second plates 22 are respectively arranged on both sides of the cushion block body 1.

[0048] In this embodiment, the cross-sectional area of the second plate 22 is the same as that of the cushion block body 1, and the side walls of the second plate 22 and the cushion block body 1 are flush. The second plate 22 is inserted into the connection gap 6. When the second plate 22 is located in the connection gap 6, the side wall of the second plate 22 abuts against the side wall of the pole group 5 that is close to each other.

[0049] In this way, the second plate 22 can enhance the connection strength between two adjacent pole groups 5, keep the width of the connection gap 6 unchanged during the assembly process of the pole group 5. When the staff pushes the pole group 5 into the shell, the thrust of the pole group 5 on the second plate 22 and the cushion block body 1 is more balanced. At the same time, it can protect the pole ear 51, reduce the assembly difficulty, and facilitate installation and disassembly.

[0050] Refer to Figure 3 and Figure 6 , in some embodiments, the length of the cushion block body 1 and the sum of the lengths of the two second plates 22 arranged at both ends of the cushion block body 1 are equal to the length of the connection gap 6. That is to say, both the second plate 22 and the cushion block body 1 are located inside the connection gap 6.

[0051] In this way, the second plate 22 and the cushion block body 1 can be quickly assembled into the connection gap 6 and fill the connection gap 6, thereby improving the connection strength between two adjacent pole groups 5, making the pole group 5 more stable during the assembly and movement processes, avoiding bending and even damage of the pole ear 51 due to the movement of the pole group 5, and improving the stability and safety of multiple pole groups 5 connected in series.

[0052] Refer to Figure 6 , in some embodiments, the protection structure further includes an insulating film 3. The insulating film 3 is arranged between the side plate 2 (refer to Figure 3 ) and the pole group 5, and the second plate 22 passes through the insulating film 3. Among them, the insulating film 3 is a mylar film, and the insulating film 3 covers the entire pole group 5.

[0053] In this way, the insulating film 3 can provide insulating protection for the pole group 5, improve the safety of the pole group 5. At the same time, it can limit the pole group 5, so that after multiple pole groups 5 are connected in series, the relative positions of the multiple pole groups 5 are relatively fixed, facilitating subsequent insertion into the shell and reducing the assembly difficulty.

[0054] It can be understood that the side plate 2 can be fixedly connected by adhering to the insulating film 3, or can only be in contact with the insulating film 3. The connection method between the side plate 2 and the insulating film 3 can be adjusted according to actual needs, as long as it can enhance the structural strength of the electrode group 5 and the connection strength of the tabs 51 between adjacent electrode groups 5. There is no need to list them in detail here.

[0055] Referring to Figure 5 and Figure 6 , the present utility model also provides a battery, which includes an electrode group set, a housing 7 and a protection structure. The electrode group set is arranged in the housing 7. The electrode group set includes at least two electrode groups 5. Tabs 51 are respectively connected to both ends of the electrode group 5 (referring to Figure 3 ), and the two tabs 51 at the ends of adjacent electrode groups 5 that are close to each other are electrically connected and pass through the installation groove 11.

[0056] In this embodiment, the electrode group set includes two electrode groups 5. The two electrode groups 5 are arranged at intervals along the length direction of the electrode group 5. The length direction of the housing 7 is parallel to the length direction of the electrode group 5. Tabs 51 with opposite electricities are respectively arranged at both ends of the electrode group 5. The tabs 51 at the ends of the two electrode groups 5 that are far away from each other are respectively located at both ends of the housing 7 and are used for connecting to an external circuit.

[0057] In this way, the second plate 22 and the pad body 1 can enhance the connection strength of the tab 51 and the overall structural strength of the electrode group set. Assembling the pad body 1 to the tab 51 and assembling the second plate 22 into the connection gap 6 can improve the structural strength at the connection gap 6, making the tab 51 located in the connection gap 6 not easy to bend or overlap when the electrode group set is pushed into the housing 7 from one end of the housing 7, reducing the assembly difficulty, and thus improving the safety and stability of the electrode group set while increasing the length of the electrode group set.

[0058] It can be understood that the electrode group set can also include more than two electrode groups 5. The pad body 1 and the second plate 22 are both arranged in the connection gap 6 between every two adjacent electrode groups 5. The number of electrode groups 5 in an electrode group set can be adjusted according to actual needs, and this embodiment does not limit this.

[0059] Referring to Figure 6 and Figure 7 , in some embodiments, an explosion-proof valve 71 is arranged at the position of the housing 7 corresponding to the second plate 22. The side plate 2 includes a first plate 21. The first plate 21 is connected to the second plate 22. An exhaust hole 211 is opened at the position of the first plate 21 close to the explosion-proof valve 71 corresponding to the explosion-proof valve 71. An exhaust groove 221 communicated with the exhaust hole 211 is opened on the second plate 22 connected to the first plate 21. A connection hole 31 is opened on the insulating film 3. The second plate 22 passes through the connection hole 31 and is located in the connection gap 6.

[0060] Among them, there are two side plates 2, which are respectively arranged on both sides of the electrode group 5. The first plate 21 and the second plate 22 are integrally formed by an injection molding process. The length direction of the first plate 21 is parallel to the length direction of the electrode group 5, and the first plate 21 is symmetrically arranged about the axis in the length direction of the second plate 22. The first plates 21 located on both sides of the second plate 22 are respectively connected to two adjacent electrode groups 5. The length direction of the exhaust groove 221 is parallel to the length direction of the second plate 22. The cross-sectional area of the connection hole 31 is adapted to the cross-sectional area of the second plate 22, so that the insulating film 3 abuts against the outer wall of the second plate 22.

[0061] In this way, the gas generated when the electrode group 5 gets out of control can flow between the housing 7 and the electrode group 5, and the connection gap 6 can be communicated with the inside of the housing 7 through the exhaust groove 221 and the exhaust hole 211, so that an annular gas channel can be formed inside the housing 7, preventing the gas from failing to flow quickly to the explosion-proof valve 71, improving the gas discharge efficiency, and enabling the gas to quickly converge to the explosion-proof valve 71, thereby improving the safety of the electrode group 5.

[0062] It can be understood that the cushion block body 1 can also be provided with ventilation holes (not shown in the figure) to further improve the gas discharge efficiency.

[0063] Refer to Figure 7 , in some embodiments, the housing 7 is connected with a positive electrode cover plate 72 and a negative electrode cover plate 73. The positive electrode cover plate 72 and the negative electrode cover plate 73 are respectively arranged at both ends of the electrode group. The protection structure further includes a support plate 4, and the support plate 4 is connected to at least one of the positive electrode cover plate 72 and the negative electrode cover plate 73.

[0064] In this embodiment, the positive electrode cover plate 72 is a light aluminum plate. The positive electrode cover plate 72 and the negative electrode cover plate 73 are respectively arranged at both ends of the housing 7 and fixedly connected to the housing 7. Insulating stickers 8 are arranged between the positive electrode cover plate 72 and the electrode group 5 and between the negative electrode cover plate 73 and the electrode group 5. And explosion-proof sheets (not shown in the figure) are arranged on both the positive electrode cover plate 72 and the negative electrode cover plate 73. The insulating sticker 8 is provided with a first hole 81 for connecting the electrode tab 51 to an external circuit and a second hole 82 corresponding to the position of the explosion-proof sheet; there is one support plate 4, and the support plate 4 is arranged between the negative electrode cover plate 73 and the electrode group 5. The support plate 4 is provided with a limiting groove 41 for the electrode tab 51 to pass through (refer to Figure 6 ).

[0065] In this way, the positive electrode cover plate 72 being a light aluminum plate can improve the space utilization rate at the positive electrode cover plate 72. At the same time, the insulating sticker 8 can prevent the positive electrode cover plate 72 from being connected to the electrode tab 51 and causing a short circuit, improving the safety of the electrode group; when the electrode group 5 is moved into the housing 7 by pushing the negative electrode cover plate 73, setting the support plate 4 can make the force on the electrode group 5 more uniform. Two adjacent electrode groups 5 are connected by the electrode tab 51, which can save the number of structures and reduce the assembly difficulty.

[0066] It is understandable that two support plates 4 can also be provided. The two support plates 4 are respectively arranged at both ends of the electrode group. The support plate 4 can be connected to the electrode group 5 by means of adhesion, hot melting, etc. The number of the support plates 4 and the connection manner with the electrode group 5 can both be adjusted according to actual needs.

[0067] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A protective cushion block, characterized in that, It is arranged between two adjacent electrode groups (5), a connection gap (6) is provided between the two electrode groups (5), the tabs (51) of the two electrode groups (5) are fixedly connected, and the protective cushion block includes: A cushion block body (1), one cushion block body (1) is arranged between two adjacent electrode groups (5), an installation groove (11) for the tab (51) to pass through is opened at one end of the cushion block body (1), and the cushion block body (1) is arranged in the connection gap (6) and connected to both electrode groups (5).

2. The protective cushion block according to claim 1, characterized in that, The end of the cushion block body (1) where the installation groove (11) is opened is provided with a rounded corner.

3. The protective cushion block according to claim 1, characterized in that, The length of the installation groove (11) is not less than the length of the tab (51) so that the tab (51) is located inside the installation groove (11).

4. The protective cushion block according to claim 1, wherein, The length of the protective cushion block is W, the length of the tab (51) is L, and 2mm < W - L; and / or, the minimum thickness of the installation groove (11) is H, and 2mm < H < 5mm for the thickness dimension.

5. A protective structure, characterized in that, It includes a side plate (2) and the protective cushion block according to any one of claims 1-4. The side plate (2) is connected to the electrode group (5). The side plate (2) includes a second plate (22). The second plate (22) is arranged in the connection gap (6). Two second plates (22) are arranged in the same connection gap (6), and the two second plates (22) are respectively arranged on both sides of the cushion block body (1).

6. The protective structure according to claim 5, characterized in that, The length of the cushion block body (1) and the sum of the lengths of the two second plates (22) arranged at both ends of the cushion block body (1) are equal to the length of the connection gap (6).

7. The protective structure according to claim 5, characterized in that, The protective structure further includes an insulating film (3). The insulating film (3) is arranged between the side plate (2) and the electrode group (5), and the second plate (22) passes through the insulating film (3).

8. A battery, characterized in that, It includes an electrode group group, a housing (7) and the protective structure according to any one of claims 5-7. The electrode group group is arranged in the housing (7). The electrode group group includes at least two electrode groups (5). The two ends of the electrode group (5) are respectively connected with tabs (51). The two tabs (51) at the mutually close ends of adjacent electrode groups (5) are electrically connected and arranged through the installation groove (11).

9. The battery according to claim 8, characterized in that, An explosion-proof valve (71) is arranged at the position of the housing (7) corresponding to the second plate (22). The side plate (2) includes a first plate (21). The first plate (21) is connected to the second plate (22). An exhaust hole (211) is opened at the position of the first plate (21) close to the explosion-proof valve (71) corresponding to the explosion-proof valve (71). An exhaust groove (221) communicated with the exhaust hole (211) is opened on the second plate (22) connected to the first plate (21). The protective structure further includes an insulating film (3). A connection hole (31) is opened on the insulating film (3). The second plate (22) passes through the connection hole (31) and is located in the connection gap (6).

10. The battery according to claim 8, characterized in that, The housing (7) is connected with a positive electrode cover plate (72) and a negative electrode cover plate (73). The positive electrode cover plate (72) and the negative electrode cover plate (73) are respectively arranged at two ends of the electrode group. The protection structure further includes a support plate (4), and the support plate (4) is connected with at least one of the positive electrode cover plate (72) and the negative electrode cover plate (73).

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