Long battery and battery pack

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a long battery and a battery pack, at least two pole groups are arranged in a shell of the long battery, the length of each pole group is shorter, the processing difficulty is low, the strength of a single pole group is improved, and the single pole group is not easy to bend and deform. The tabs of the two adjacent pole groups extend in the direction close to each other along the length direction of the pole groups and are stacked along the thickness direction of the pole groups, and the length of the tabs is relatively short, so that the internal resistance of the long battery can be reduced, and meanwhile, the occupied space is relatively small. Besides, the two adjacent first supporting pieces in the length direction of the pole groups abut against each other, and the first mounting space for accommodating the pole lugs is formed between the two adjacent pole groups, so that good support is provided for the pole groups, when the long battery shakes, the connecting positions of the pole lugs are not influenced, and the connection reliability is high. The utility model further provides a battery pack which comprises a plurality of long batteries.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a long battery and a battery pack. Background Art

[0002] 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. To meet the growing demand for driving range, battery companies have developed a series of high-capacity batteries and continuously explored how to improve the effective space utilization rate inside the battery and increase the volume energy density of the battery. Large-capacity batteries such as blade batteries (BYD), L-series long batteries (SVOLT), and CTP module-free batteries (CATL) have emerged one after another.

[0003] Among them, for long batteries, the length of the electrode group in the shell is relatively long. Due to its strength problem, the electrode group often bends and deforms when entering the shell, resulting in a low manufacturing yield. And for an electrode group with a very long length, the requirements for its forming process are relatively high, the supporting structure of the electrode group is relatively complex, and the processing difficulty is large. For this reason, some technical solutions for setting the electrode groups with a relatively long length in sections have emerged in the prior art. However, in these solutions, when connecting two adjacent electrode groups in the shell, the electrode tabs of the electrode groups often adopt a C-shaped or S-shaped bending connection. The electrode tabs are relatively long, requiring a relatively large space, and the relatively long electrode tabs will also increase the internal resistance of the electrode group. In addition, there is a lack of support at the connection of the electrode tabs. If the support is unbalanced, the electrode group is likely to cause damage to the electrode tabs when moving. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a long battery and a battery pack, which are internally provided with a supporting structure for supporting the connection of the electrode tabs between two adjacent electrode groups, avoiding damage to the electrode tabs. At the same time, the electrode tabs of two adjacent electrode groups adopt a linear structure to overlap each other, reducing the occupied space and being beneficial to reducing the internal resistance.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] On the one hand, the utility model provides a long battery, including:

[0007] A shell, with openings provided at both ends in the length direction of the shell;

[0008] Electrode groups, with at least two provided and installed into the shell through the openings. The electrode tabs of two adjacent electrode groups extend towards each other in the length direction of the electrode group and are stacked in the thickness direction of the electrode group;

[0009] The first support member is provided with at least four and is located inside the housing. Every two of the first support members are symmetrically arranged along the width direction of the electrode group; two adjacent first support members along the length direction of the electrode group abut against each other and form a first installation space between two adjacent electrode groups, and the first installation space is used to accommodate the tab.

[0010] Optionally, the first support member includes a first support portion and a second support portion. The first support portion is connected to the end face in the length direction of the electrode group, and the second support portion is connected to the end face in the width direction of the electrode group. The first support portions of two adjacent first support members along the length direction of the electrode group abut against each other and form the first installation space between two adjacent electrode groups.

[0011] Optionally, the long battery includes a cover plate assembly. The cover plate assembly is connected to the opening. A second installation space is formed between the cover plate assembly and the electrode group along the length direction of the electrode group. An exhaust port is provided between two mutually abutting first support portions; the first installation space, the exhaust port, the gap between the electrode group and the housing along the width direction of the electrode group, and the second installation space are sequentially communicated to form an annular exhaust passage.

[0012] Optionally, a first explosion-proof valve is provided on the cover plate assembly, and the first explosion-proof valve is communicated with the second installation space.

[0013] Optionally, the long battery includes a second support member. The second support member is arranged at the end in the length direction of the electrode group. A through hole is provided on the second support member, and the tab of the electrode group passes through the through hole and is connected to the pole column on the cover plate assembly.

[0014] Optionally, along the thickness direction of the electrode group, a notch is recessed on the second support portion;

[0015] And / or, a plurality of the notches are provided, and the plurality of notches are arranged at intervals along the length direction of the electrode group;

[0016] And / or, a positioning hole is provided on the second support portion.

[0017] Optionally, along the width direction of the electrode group, the size of the first support portion is L1, the size of the electrode group is L2, and 0.25≤L1 / L2≤0.4, 20mm≤L1≤150mm;

[0018] And / or, along the thickness direction of the electrode group, the size of the second support portion is W, the size of the electrode group is H, and 0.5mm≤(H-W) / 2≤1.0mm, W>10mm.

[0019] Optionally, the long battery includes a protective sticker which is connected to two adjacent pole groups, and the projection of the protective sticker on the housing covers the pole ear along the thickness direction of the pole group.

[0020] And / or, the long battery includes an insulating film which covers all the pole groups, and a cut hole is provided on the insulating film. The projection of the cut hole on the housing covers the protective sticker along the thickness direction of the pole group.

[0021] Optionally, the long battery includes a second explosion-proof valve. An installation hole is provided on the housing, and the second explosion-proof valve is arranged in the installation hole. The projection of the second explosion-proof valve on the housing at least partially coincides with the projection of the pole ear on the housing along the thickness direction of the pole group, and the second explosion-proof valve is communicated with the first installation space.

[0022] On the other hand, the present utility model provides a battery pack, which includes a box body and several long batteries in any of the above solutions, and the several long batteries are arranged in the box body.

[0023] The beneficial effects of the present utility model are as follows:

[0024] The present utility model provides a long battery, which includes a housing, a pole group and a first support member. At least two pole groups are arranged in the housing, the length of the pole group is relatively shortened, the processing difficulty is reduced, the strength of a single pole group is improved, and the problem of bending deformation is not likely to occur. The pole ears of two adjacent pole groups extend towards the direction close to each other along the length direction of the pole group and are stacked along the thickness direction of the pole group, so that the lengths of the two pole ears are short, which is beneficial to reducing the internal resistance of the long battery. At the same time, the space occupied by the pole ears in the length direction of the housing is small, the space utilization rate is improved, and the energy density is high. In addition, two adjacent first support members in the length direction of the pole group abut against each other and form a first installation space for accommodating the pole ears between the two adjacent pole groups. The first support member provides good support for the pole group, the supporting force in the length direction of the pole group is balanced, the structural strength is high, and the connection position of the two pole ears is located in the first installation space. The first support member also provides good support for the connection position of the two pole ears. When the long battery shakes, the connection position of the pole ears will not be affected, and the connection reliability is high.

[0025] The present utility model also provides a battery pack, which includes a box body and several long batteries as described above, and the several long batteries are arranged in the box body. By adopting the above long battery, the safety performance of the battery pack can be improved, and at the same time, the battery pack has a high energy density and a high structural strength. Description of the Drawings

[0026] Figure 1 is an exploded view of the long battery provided in the embodiment of the present utility model;

[0027] Figure 2 is Figure 1 The partial enlarged view at position A in

[0028] Figure 3 is Figure 1 The partial enlarged view at position B in

[0029] Figure 4 The front view after the assembly of the electrode group and the first support member provided in the embodiment of the present utility model;

[0030] Figure 5 is Figure 4 The sectional view of the C-C section in

[0031] Figure 6 is Figure 5 The partial enlarged view at position D in

[0032] Figure 7 The structural schematic diagram of the first support member provided in the embodiment of the present utility model;

[0033] Figure 8 is Figure 7 The partial enlarged view at position E in

[0034] Figure 9 The top view of the first support member provided in the embodiment of the present utility model;

[0035] Figure 10 The sectional view of the long battery provided in the embodiment of the present utility model;

[0036] Figure 11 is Figure 10 The partial enlarged view at position F in

[0037] Figure 12 is Figure 10 The partial enlarged view at position G in

[0038] In the figure:

[0039] 100, housing; 110, opening; 120, mounting hole; 130, second explosion-proof valve;

[0040] 200, electrode group; 210, tab;

[0041] 300, first support member; 310, first support portion; 311, body; 312, support rib; 313, exhaust groove; 3101, first installation space; 3102, exhaust port; 320, second support portion; 321, notch; 322, positioning hole;

[0042] 400, cover plate assembly; 410, first explosion-proof valve; 420, terminal; 4001, second installation space;

[0043] 500, the second support member; 510, the perforation;

[0044] 600, the protective sticker;

[0045] 700, the insulating film; 710, the cutting hole. Detailed implementation manner

[0046] The present utility model will be further described in detail below with reference to 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. In addition, 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.

[0047] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should 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 elements or the interaction relationship between two elements. 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.

[0048] 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 between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0049] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left", and "right" are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore 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.

[0050] Such as Figures 1-6As shown in the figure, this embodiment provides a long battery, which includes a housing 100, a pole group 200, and a first support member 300. Among them, an opening 110 is provided at the end of the housing 100 in the length direction, and at least two pole groups 200 are provided and are installed in the housing 100 through the opening 110. In this embodiment, two pole groups 200 are taken as an example for illustration, and the two pole groups 200 are arranged adjacent to each other in the length direction of the housing 100. The pole tabs 210 of two adjacent pole groups 200 extend in a direction approaching each other in the length direction of the pole group 200, and are stacked in the thickness direction of the pole group 200. The pole tabs 210 of two adjacent pole groups 200 can be fixedly connected by welding. Further, four first support members 300 are provided and are located inside the housing 100, and every two first support members 300 are symmetrically arranged in the width direction of the pole group 200; two adjacent first support members 300 in the length direction of the pole group 200 are in contact with each other and form a first installation space 3101 between the two adjacent pole groups 200, and the first installation space 3101 is used to accommodate the pole tabs 210 (see Figure 11 ). It should be noted that the length direction of the housing 100 and the length direction of the pole group 200 are both the Figure 1 and Figure 4 shown in the X-axis direction in the figure, the thickness direction of the pole group 200 is the Figure 1 and Figure 5 shown in the Y-axis direction in the figure, and the width direction of the pole group 200 is the Figure 1 and Figure 4 shown in the Z-axis direction in the figure.

[0051] Since multiple pole groups 200 are provided in this embodiment, the length of the pole group 200 is relatively shortened, the processing difficulty is reduced, the strength of a single pole group 200 is improved, and the problem of bending deformation is not likely to occur. And the pole tabs 210 of two adjacent pole groups 200 both extend out of the pole group 200 along a straight line (the length direction of the pole group 200) and are stacked in the thickness direction of the pole group 200, so that the lengths of the two pole tabs 210 are shorter, which is beneficial to reducing the internal resistance of the long battery. At the same time, the space occupied by the pole tabs 210 in the length direction inside the housing 100 is smaller, and the space utilization rate is improved. In addition, through the setting of the first support member 300 on the pole group 200, good support is also provided for the pole group 200. The support forces in the length direction of the pole group 200 are balanced, and the structural strength is high. And the connection position of the two pole tabs 210 is located in the first installation space 3101, and the first support member 300 also provides good support for the connection position of the two pole tabs 210. When the long battery shakes, the connection position of the pole tabs 210 will not be affected, and the connection reliability is high.

[0052] As an alternative solution, see Figures 7-9, in this embodiment, the first support member 300 is L-shaped. The first support member 300 includes a first support portion 310 and a second support portion 320 that are perpendicular to each other. The first support portion 310 is connected to the end face in the length direction of the electrode group 200, and the second support portion 320 is connected to the end face in the width direction of the electrode group 200. The first support portions 310 of two adjacent first support members 300 along the length direction of the electrode group 200 abut against each other and form a first installation space 3101 between two adjacent electrode groups 200. Exemplarily, the first support member 300 in this example is made of an insulating material. For example, the first support member 300 can be made of polyester materials such as PP, PC, or PET. It has good insulation and certain structural strength, and can provide good support for the electrode group 200. In addition, the first support member 300 can be fixed to the electrode group 200 by bonding, and the connection strength is relatively high.

[0053] Further, referring to Figure 3 , Figures 10-12 , the long battery includes a cover plate assembly 400. The cover plate assembly 400 is connected to the opening 110 to encapsulate the electrode group 200 in the housing 100. A second installation space 4001 is formed between the cover plate assembly 400 and the electrode group 200 along the length direction of the electrode group 200. An exhaust port 3102 is provided between two mutually abutting first support portions 310; the first installation space 3101, the exhaust port 3102, the gap between the electrode group 200 and the housing 100 along the width direction of the electrode group 200, and the second installation space 4001 are sequentially communicated to form an annular exhaust passage. Thus, the gas path inside the long battery is smooth. On the one hand, during liquid injection, the electrolyte can spread to all positions of the electrode group 200 via the annular exhaust passage, so that the electrode group 200 (including the electrode tab 210 at the first installation space 3101) is completely immersed in the electrolyte, improving the performance of the long battery; on the other hand, through the setting of the annular exhaust passage, when a certain electrode group 200 undergoes thermal runaway, the high-temperature and high-pressure gas and liquid can be discharged via the annular exhaust passage to achieve rapid pressure relief.

[0054] Optionally, a first explosion-proof valve 410 is provided on the cover plate assembly 400. The first explosion-proof valve 410 is communicated with the second installation space 4001. Thus, when the pressure inside the housing 100 exceeds the opening pressure of the first explosion-proof valve 410, the high-temperature and high-pressure gas can blow open the first explosion-proof valve 410 to release the pressure inside the housing 100 and ensure the safety of the long battery.

[0055] In addition, since the size of the electrode group 200 in the length direction is relatively large in this embodiment, in order to shorten the gas path and make the exhaust more smooth, the long battery in this embodiment further includes a second explosion-proof valve 130. An installation hole 120 is provided at the middle position of the length of the housing 100, and the second explosion-proof valve 130 is disposed in the installation hole 120. The projection of the second explosion-proof valve 130 on the housing 100 at least partially coincides with the projection of the tab 210 on the housing 100 in the thickness direction of the electrode group 200, and the second explosion-proof valve 130 communicates with the first installation space 3101. Thus, when the air pressure inside the housing 100 is relatively high and exceeds the opening pressure of the second explosion-proof valve 130, the high-temperature and high-pressure gas can also break through the second explosion-proof valve 130 and be discharged out of the housing 100 through the first installation space 3101 and the second explosion-proof valve 130. This ensures that the path of the annular exhaust passage inside the long battery is relatively short, which is conducive to achieving rapid pressure relief and ensuring the safety of the long battery.

[0056] Optionally, the long battery includes a second support member 500. The second support member 500 is disposed at the end of the electrode group 200 in the length direction and is clamped between the cover plate assembly 400 and the electrode group 200. A through hole 510 is provided on the second support member 500. The tab 210 of the electrode group 200 passes through the through hole 510 and is connected to the pole column 420 on the cover plate assembly 400. Thus, through the arrangement of the second support member 500, good support can be provided for the width direction of the electrode group 200, further improving the support effect on the electrode group 200 and ensuring that the electrode group 200 is not easily bent and deformed. Exemplarily, the second support member 500 is also made of an insulating material. For example, the second support member 500 can be made of polyester materials such as PP, PC, or PET, which have good insulation and certain structural strength and can provide good support for the electrode group 200. In addition, the second support member 500 can be fixed to the electrode group 200 by bonding, and the connection strength is relatively high.

[0057] Continue to refer to Figures 7-9, in this embodiment, the first support portion 310 includes a body 311 and support ribs 312. The body 311 is connected to the end of the electrode group 200 in the length direction, and the support ribs 312 face the first support portion 310 on the adjacent electrode group 200. Each support rib 312 is provided with an exhaust groove 313. After two adjacent first support portions 310 are abutted against each other, the exhaust grooves 313 recessed on the two support ribs 312 jointly form the above-mentioned exhaust port 3102, and the first installation space 3101 is communicated with the gap between the electrode group 200 and the housing 100 along the width direction of the electrode group 200 through the exhaust port 3102, ensuring smooth exhaust. Further, in order to improve the structural strength of the first support portion 310 and enhance the support effect on the electrode group 200, a plurality of support ribs 312 can be arranged at intervals along the width direction of the electrode group 200 on the body 311, and each support rib 312 is provided with the above-mentioned exhaust groove 313. Exemplarily, three support ribs 312 are provided in this embodiment.

[0058] Of course, in other embodiments, among two adjacent first support portions 310, an exhaust groove 313 can also be provided only on one of the first support portions 310. After the two first support portions 310 are abutted against each other, an exhaust port 3102 can also be formed therebetween. Only the size of the exhaust port 3102 is relatively reduced at this time, but the function of communicating the first installation space 3101 with the gap between the electrode group 200 and the housing 100 along the width direction of the electrode group 200 can also be achieved.

[0059] Further, along the thickness direction of the electrode group 200, a notch 321 is recessed on the second support portion 320. By providing the notch 321, the material used for the first support member 300 can be relatively reduced, the cost can be lowered, and at the same time, the setting of the notch 321 also provides a larger relief space, so that the gap between the electrode group 200 and the housing 100 along the width direction of the electrode group 200 is larger, the flow area of the annular exhaust passage is increased, which is beneficial to realizing rapid exhaust, and the exhaust gas path is smoother. Of course, a plurality of the above-mentioned notches 321 can be provided, and the plurality of notches 321 are arranged at intervals along the length direction of the electrode group 200. In addition, a positioning hole 322 is further provided on the second support portion 320. Through the setting of the positioning hole 322, it is convenient to position the electrode group 200 and the first support member 300 during the assembly of the two, and the assembly accuracy is relatively high. Exemplarily, two positioning holes 322 can be provided, and the two positioning holes 322 are respectively arranged at both ends of the second support portion 320 in the length direction. The length direction of the second support portion 320 is the length direction of the electrode group 200.

[0060] Continue to refer to Figure 4, along the width direction of the electrode group 200, the dimension of the first support portion 310 is L1, the dimension of the electrode group 200 is L2, 0.25 ≤ L1 / L2 ≤ 0.4, 20 mm ≤ L1 ≤ 150 mm. Exemplarily, the value of L1 can be 20 mm, 30 mm, 50 mm, 80 mm, 100 mm, 120 mm, 150 mm, etc., and can be specifically adjusted according to the dimension in the width direction of the electrode group 200. Additionally, the value of L1 / L2 can be 0.25, 0.3, 0.35, 0.4, etc. The value of L1 / L2 should not be too small so as to increase the dimension of the first support portion 310 in the width direction of the electrode group 200 and improve the support effect on the electrode group 200; the value of L1 / L2 should not be too large so as to provide sufficient connection space for the tab 210, make the dimension of the first installation space 3101 in the width direction of the electrode group 200 large enough, and also make the exhaust space large.

[0061] Further, referring to Figure 5 and Figure 9 , along the thickness direction of the electrode group 200, the dimension of the second support portion 320 is W, the dimension of the electrode group 200 is H, 0.5 mm ≤ (H - W) / 2 ≤ 1.0 mm, W > 10 mm. Exemplarily, the value of W can be 12 mm, 13 mm, 14 mm, 15 mm, etc., and the value of H can be 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, etc., as long as it satisfies the above value range. Such a setting is to make the dimension of the second support portion 320 in the thickness direction of the electrode group 200 smaller than the dimension in the thickness direction of the electrode group 200, so that it is not easy to interfere with the housing 100 when the electrode group 200 and the second support portion 320 are inserted into the housing. Additionally, along the thickness direction of the electrode group 200, the dimension difference between the second support portion 320 and the electrode group 200 is small, which is also to improve the structural strength of the second support portion 320 as much as possible to provide better support for the electrode group 200.

[0062] Continuing to refer to Figure 1 and Figure 2 , the long battery in this embodiment includes a protective sticker 600. The protective sticker 600 is connected to two adjacent electrode groups 200, and along the thickness direction of the electrode group 200, the projection of the protective sticker 600 on the housing 100 covers the tab 210. Through the setting of the protective sticker 600, it can provide a certain protective effect for the two tabs 210, avoid the tabs 210 from being scratched, and at the same time avoid the welding slag at the welding joint of the two tabs 210 from falling off, resulting in the risk of short circuit. It should be noted that two protective stickers 600 can be provided, and the two protective stickers 600 are respectively arranged on both sides in the thickness direction of the electrode group 200 to provide multi-directional protection for the tab 210. Exemplarily, the protective sticker 600 can be made of insulating materials. For example, the protective sticker 600 can be PET, PP, PC, ABS, etc. The protective sticker 600 can be adhered to the electrode group 200 through an adhesive.

[0063] Furthermore, the long battery further includes an insulating film 700, which is wrapped around all the electrode groups 200 (see Figure 11 , Figure 12 ). The insulating film 700 can insulate the electrode group 200 from the housing 100. Exemplarily, the insulating film 700 can also be made of insulating materials such as PET, PP, and PC. After the electrode group 200 is inserted into the insulating film 700, the insulating film 700 can be fixed to the second support portion 320 of the first support member 300 by hot melting, so that the insulating film 700 is fixed outside the electrode group 200, avoiding its position deviation, with accurate positioning and good fixing effect.

[0064] In addition, the insulating film 700 may be provided with a cut hole 710. The projection of the cut hole 710 on the housing 100 along the thickness direction of the electrode group 200 covers the protective sticker 600, that is, the size of the cut hole 710 is larger than the size of the protective sticker 600. When problems are found at the welding joint of the electrode tabs 210 of the two electrode groups 200, operations can be performed on the protective sticker 600 and the electrode tabs 210 through the cut hole 710, without the need to remove the entire insulating film 700, and the repair is more convenient and fast.

[0065] Optionally, in this embodiment, there are two openings 110 on the housing 100, and there are also two cover plate assemblies 400. One of the cover plate assemblies 400 is a positive electrode cover plate, and the other cover plate assembly 400 is a negative electrode cover plate. The positive electrode cover plate and the negative electrode cover plate are respectively connected to the two openings 110. For convenience of description, the two electrode groups 200 are respectively denoted as the first electrode group and the second electrode group. The first electrode group includes a positive electrode tab and a negative electrode tab, and the second electrode group also includes a positive electrode tab and a negative electrode tab. The electrode post 420 on the positive electrode cover plate is connected to the positive electrode tab of the first electrode group, the electrode post 420 on the negative electrode cover plate is connected to the negative electrode tab of the second electrode group, the negative electrode tab of the first electrode group is connected to the positive electrode tab of the second electrode group, and the connection point of the negative electrode tab of the first electrode group and the positive electrode tab of the second electrode group is located in the first installation space 3101.

[0066] This embodiment also provides a battery pack, which includes a box body and a plurality of the above-mentioned long batteries, and the plurality of long batteries are arranged in the box body. By adopting the long battery in this embodiment, the safety performance of the battery pack can be improved, and at the same time, the battery pack has a high energy density and high structural strength.

[0067] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. 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 utility model. 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 utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A long battery, characterized in that, Comprising: A housing, with openings provided at both ends in the length direction of the housing; At least two electrode groups are provided and are inserted into the housing through the openings. The tabs of adjacent electrode groups extend towards each other in the length direction of the electrode groups and are stacked in the thickness direction of the electrode groups; At least four first support members are provided and are located inside the housing. Every two of the first support members are symmetrically arranged in the width direction of the electrode group; Two adjacent first support members in the length direction of the electrode group are in contact with each other and form a first installation space between the two adjacent electrode groups, and the first installation space is used to accommodate the tabs.

2. The long battery according to claim 1, wherein The first support member includes a first support portion and a second support portion. The first support portion is connected to the end face in the length direction of the electrode group, and the second support portion is connected to the end face in the width direction of the electrode group. The first support portions of two adjacent first support members in the length direction of the electrode group are in contact with each other and form the first installation space between the two adjacent electrode groups.

3. The long battery according to claim 2, characterized in that, The long battery includes a cover plate assembly, the cover plate assembly is connected to the opening, and a second installation space is formed between the cover plate assembly and the electrode group in the length direction of the electrode group. An exhaust port is provided between the two mutually contacting first support portions; The first installation space, the exhaust port, the gap between the electrode group and the housing in the width direction of the electrode group, and the second installation space are sequentially connected to form an annular exhaust channel.

4. The long battery according to claim 3, characterized in that, A first explosion-proof valve is provided on the cover plate assembly, and the first explosion-proof valve is communicated with the second installation space.

5. The long battery according to claim 3, wherein The long battery includes a second support member, the second support member is provided at the end in the length direction of the electrode group, and a through hole is provided on the second support member. The tab of the electrode group passes through the through hole and is connected to the pole column on the cover plate assembly.

6. The long battery according to claim 2, wherein In the thickness direction of the electrode group, a notch is recessed on the second support portion; And / or, a plurality of the notches are provided, and the plurality of notches are arranged at intervals in the length direction of the electrode group; And / or, positioning holes are provided on the second support portion.

7. The long battery according to claim 2, wherein, In the width direction of the electrode group, the size of the first support portion is L1, the size of the electrode group is L2, and 0.25 ≤ L1 / L2 ≤ 0.4, 20 mm ≤ L1 ≤ 150 mm; And / or, in the thickness direction of the electrode group, the size of the second support portion is W, the size of the electrode group is H, and 0.5 mm ≤ (H - W) / 2 ≤ 1.0 mm, W > 10 mm.

8. The long battery according to claim 1, characterized in that The long battery includes a protective sticker, the protective sticker is connected to two adjacent electrode groups, and in the thickness direction of the electrode group, the projection of the protective sticker on the housing covers the tab; And / or, the long battery includes an insulating film, the insulating film is coated outside all the electrode groups, a cut hole is provided on the insulating film, and in the thickness direction of the electrode group, the projection of the cut hole on the housing covers the protective sticker.

9. The long battery according to claim 8, characterized in that, The long battery includes a second explosion-proof valve. An installation hole is provided on the housing, and the second explosion-proof valve is disposed in the installation hole. Along the thickness direction of the electrode group, the projection of the second explosion-proof valve on the housing at least partially coincides with the projection of the tab on the housing, and the second explosion-proof valve communicates with the first installation space.

10. A battery pack, characterized in that, It includes a box body and a plurality of long batteries according to any one of claims 1-9, and a plurality of the long batteries are disposed in the box body.

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