Battery and battery pack

Abstract

The embodiment of the utility model provides a battery and a battery pack. A shell of the battery is provided with a first opening and a second opening at two ends along a third direction; the first cover plate assembly comprises a first cover plate which covers the first opening and is connected with the shell, and a first pole is arranged on the first cover plate in a penetrating manner; the second cover plate assembly comprises a second cover plate which covers the second opening and is connected with the shell, and a second pole is arranged on the second cover plate in a penetrating manner; the electrode assembly is arranged in the shell and comprises an electrode body, a first tab and a second tab, the first tab and the second tab are connected with the two sides, in the third direction, of the electrode body respectively, and the length, in the first direction, of the electrode body is larger than that, in the third direction, of the electrode body; the first pole is fixedly connected with the first tab, the second pole is fixedly connected with the second tab, and the length of the first pole in the first direction is greater than that of the first pole in the second direction. Therefore, the structural firmness and the heat dissipation effect of the battery are improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a battery and battery pack. Background Technology

[0002] In recent years, with the continuous development of new energy technologies, power batteries, as the power source for these technologies, have been widely used. To improve the charging rate of power batteries, the charging time can be shortened; to improve the discharging rate, the output power of the power battery can be increased.

[0003] However, batteries typically have their positive and negative tabs positioned on opposite sides. Compared to having them on the same side, this arrangement increases the electrical connection area between the terminals and tabs. But due to the continuous increase in charging rate and output power, the temperature of power batteries rises faster, thus affecting their safety performance. Utility Model Content

[0004] To solve or partially solve the above problems, this utility model discloses a battery that addresses the issue of rapid temperature rise caused by increasing the charge / discharge rate of existing batteries.

[0005] To address the aforementioned problems, this utility model provides a battery having intersecting first, second, and third directions, and the battery includes:

[0006] The housing has a first opening and a second opening at both ends along the third direction;

[0007] The first cover plate assembly includes a first cover plate that covers the first opening and is connected to the housing, and a first pole post is provided through the first cover plate;

[0008] The second cover plate assembly includes a second cover plate that covers the second opening and is connected to the housing, and a second pole post is provided through the second cover plate;

[0009] An electrode assembly is disposed within the housing. The electrode assembly includes an electrode body, a first electrode tab, and a second electrode tab. The first electrode tab and the second electrode tab are respectively connected to the two sides of the electrode body along the third direction. The length of the electrode body along the first direction is greater than the length of the electrode body along the third direction.

[0010] The first pole post is fixedly connected to the first pole tab, and the second pole post is fixedly connected to the second pole tab. The length of the first pole post in the first direction is greater than the length of the first pole post in the second direction.

[0011] Optionally, the length of the second pole in the first direction is greater than the length of the second pole in the second direction.

[0012] Optionally, the first pole post includes a riveting portion and a connecting portion, the riveting portion and the connecting portion are connected along the third direction, the connecting portion is fixedly connected to the first pole lug, the riveting portion includes a first riveting portion, the first riveting portion is located outside the housing, and the length of the first riveting portion along the first direction is greater than the length along the second direction.

[0013] Optionally, the riveting part further includes a second riveting part, which is connected to the first riveting part along the third direction. The second riveting part passes through the first cover plate and is connected to the connecting part.

[0014] The area of ​​the projection of the first riveting part onto the first cover plate along the third direction is greater than the area of ​​the projection of the second riveting part onto the first cover plate along the third direction.

[0015] Optionally, the first cover plate assembly further includes a first insulating member, which abuts against the first riveted portion and the first cover plate.

[0016] Optionally, the first cover plate assembly further includes a second insulating member and a sealing member. The second insulating member is located inside the housing and connected to the side of the first cover plate near the electrode assembly. The sealing member includes a first sealing portion and a second sealing portion connected along the third direction. The first sealing portion abuts against the first cover plate and the connecting portion along the third direction, and the second sealing portion abuts against the first cover plate and the connecting portion along the first direction.

[0017] Optionally, the connecting portion includes a first connecting portion and a second connecting portion connected along the third direction, the first connecting portion being disposed close to the electrode assembly, and the second connecting portion being connected to the riveting portion;

[0018] The area of ​​the projection of the first connecting portion onto the first cover plate along the third direction is greater than the area of ​​the projection of the second connecting portion onto the first cover plate along the third direction.

[0019] Optionally, the number of electrode assemblies is multiple, the multiple electrode assemblies are arranged along the second direction, the multiple first electrode tabs are arranged along the second direction, and the multiple first electrode tabs are fixedly connected to the first electrode post.

[0020] Optionally, the battery may also include an explosion-proof valve;

[0021] The explosion-proof valve is mounted on the housing;

[0022] Alternatively, the battery may further include an insulating film layer located inside the housing, the insulating film layer covering the electrode assembly, and the insulating film layer having multiple heat dissipation holes extending through it.

[0023] This utility model embodiment also provides a battery pack, which includes the battery described in any of the above embodiments.

[0024] In this embodiment of the invention, since the length of the electrode body along the first direction is greater than the length of the electrode body along the third direction, and the length of the first electrode post in the first direction is greater than the length of the first electrode post in the second direction, not only is the end face of the first tab in contact with the electrode body the end face with the largest area in the electrode body, but the setting area of ​​the first electrode post can also be maximized. This increases the area occupied by the first tab on the electrode body, thereby increasing the area of ​​the electrical connection between the first tab and the first electrode post, increasing the current carrying capacity of the first tab, improving the charge and discharge rate of the battery, and improving the structural robustness and heat dissipation effect of the battery, thus increasing the battery's service life. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the exploded structure of a battery provided in an embodiment of this utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of a battery provided in an embodiment of this utility model;

[0028] Figure 3 This utility model provides a battery in... Figure 3 A magnified view of a portion of point A in the middle;

[0029] Figure 4 This is an assembly diagram of the terminals and cover plate included in a battery according to an embodiment of the present utility model;

[0030] Figure 5 This is a schematic diagram of the external structure of a battery according to an embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of the internal structure of another battery provided in an embodiment of the present invention;

[0032] Figure 7This is another type of battery provided in this embodiment of the utility model. Figure 6 A magnified view of a portion of point B in the middle.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1: Housing; 11: First opening; 12: Second opening; 2: First cover plate assembly; 21: First cover plate; 22: First pole post; 221: Riveting part; 2211: First riveting part; 2212: Second riveting part; 222: Connecting part; 2221: First connecting part; 2222: Second connecting part; 3: Second cover plate assembly; 31: Second cover plate; 32: Second pole post; 4: Electrode assembly; 41: Electrode body; 42: First electrode tab; 43: Second electrode tab; 5: First insulating component; 6: Second insulating component; 7: Sealing component; 71: First sealing part; 72: Second sealing part; 8: Explosion-proof valve. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0037] like Figures 1 to 7 As shown, the battery has two intersecting third directions Z, a first direction X, and a second direction Y. The battery includes:

[0038] The housing 1 has a first opening 11 and a second opening 12 at both ends along the third direction Z.

[0039] The first cover plate assembly 2 includes a first cover plate 21, which covers the first opening 11 and is connected to the housing 1. A first pole post 22 is provided on the first cover plate 21.

[0040] The second cover plate assembly 3 includes a second cover plate 31, which covers the second opening 12 and is connected to the housing 1. A second pole post 32 is provided on the second cover plate 31.

[0041] Electrode assembly 4 is disposed inside housing 1. Electrode assembly 4 includes electrode body 41, first electrode tab 42 and second electrode tab 43. The first electrode tab 42 and the second electrode tab 43 are respectively connected to the two sides of electrode body 41 along the third direction Z. The length of electrode body 41 along the first direction X is greater than the length of electrode body 41 along the third direction Z.

[0042] The first pole post 22 is fixedly connected to the first pole tab 42, and the second pole post 32 is fixedly connected to the second pole tab 43. The length of the first pole post 22 in the first direction X is greater than the length of the first pole post 22 in the second direction Y.

[0043] As can be seen from the above embodiments, in this embodiment of the utility model, the second cover plate assembly 3 also includes the same structure as the first insulating member 5 and the second insulating member 6, and the second cover plate assembly 3 has the same structure as the first cover plate assembly 2.

[0044] Since the length of the electrode body 41 along the first direction X is greater than the length of the electrode body 41 along the third direction Z, and the length of the first electrode post 22 in the first direction X is greater than the length of the first electrode post 22 in the second direction Y, not only is the end face of the first tab 42 in contact with the electrode body 41 the end face with the largest area in the electrode body 41, but the setting area of ​​the first electrode post 22 can also be maximized. This increases the area occupied by the first tab 42 on the electrode body 41, thereby increasing the area of ​​the electrical connection between the first tab 42 and the first electrode post 22, increasing the current carrying capacity of the first tab 42, improving the battery charge and discharge rate, and improving the structural robustness and heat dissipation effect of the battery, thus increasing the battery's service life.

[0045] In the above embodiments, the housing 1 can be cylindrical, square, or other shapes. The specific shape and type of the housing 1 are determined based on the shape of the electrode assembly 4 within the housing 1's accommodating cavity, and this embodiment of the present invention does not limit this. The housing 1 can be a structure with openings at both ends, so that the housing 1 has a first opening 11 and a second opening 12 at both ends along a third direction. Furthermore, the material of the housing 1 can be any of aluminum alloy, steel, polypropylene, polycarbonate, etc.

[0046] The first cover plate 21 and the second cover plate 31 are structures used to protect the battery and prevent it from being damaged. The first cover plate 21 and the second cover plate 31 can not only protect the battery from external substances such as water, sand, and soil, but also prevent the battery from being impacted and squeezed, thus improving the battery's safety performance.

[0047] In this embodiment of the invention, a first terminal 22 is disposed in the first cover plate 21, and the first terminal 22 is used to connect the first battery tab 42 and connect the first battery tab 42 to an external circuit. A second terminal 32 is disposed in the second cover plate 31, and the second terminal 32 is used to connect the second battery tab 43. The materials of the first terminal 22 and the second terminal 32 are typically metals with good electrical conductivity such as copper, nickel, and aluminum to ensure smooth current flow. The first cover plate 21 and the second cover plate 31 are frame structures with good performance and high temperature resistance, such as copper, nickel, and aluminum. The first cover plate 21 covers the first opening 11 and is connected to the housing 1, and the second cover plate 31 covers the second opening 12 and is connected to the housing 1.

[0048] The shape of the first cover plate 21 and the shape of the second cover plate 31 are determined according to the shape of the housing 1. For example, when the shape of the housing 1 is cylindrical, the shape of the first cover plate 21 and the shape of the second cover plate 31 are both circular. When the shape of the housing 1 is square, the shape of the first cover plate 21 and the shape of the second cover plate 31 are both square.

[0049] Furthermore, since the first cover plate 21 has a first pole post 22 passing through it, and the second cover plate 31 has a second pole post 32 passing through it, insulation treatment is required when connecting the first cover plate 21 and the first pole post 22, and insulation treatment is also required when connecting the second cover plate 31 and the second pole post 32. Typically, the first cover plate 21 has a first pole post hole for the first pole post 22 to pass through. One end of the first pole post 22 passes through the first pole post hole, and the other end connects to the first pole lug 42. The contact area between the first pole post 22 and the first cover plate 21 is sealed by injection molding. The connection method between the second cover plate 31 and the second pole post 32 is the same as that between the first cover plate 21 and the first pole post 22, and will not be described again in this embodiment. The first cover plate 21 and the housing 1, and the second cover plate 31 and the housing 1, can be connected by welding. The welding can be at least one of the following welding methods: CO2 shielded welding, resistance spot welding, laser welding, etc.

[0050] In addition, the electrode assembly 4 includes an electrode body 41, a first tab 42, and a second tab 43. The electrode body 41 may include multiple stacked electrode sheets, which enables the battery to adopt a stacking process, thereby making full use of the space inside the casing 1, increasing the energy density, improving the structural stability and safety performance of the battery, and increasing the cycle life of the battery.

[0051] It should be noted that the electrode body 41 is typically square and usually includes a first end face and a second end face connected together. The first end face is disposed relative to the first cover plate 21 along a third direction Z and extends along a first direction X. That is, the first end face can be parallel to the plane formed by the first direction X and the second direction Y, and the second end face can be parallel to the plane formed by the second direction Y and the third direction Z. Since the area of ​​the first end face is larger than the area of ​​the second end face, the end face of the electrode body 41 facing the first tab 42 is the end face with the largest area in the electrode body 41. Since the first tab 42 is disposed on the first end face, the size of the first tab 42 in the first direction X and the second direction Y can be increased, thereby increasing the area of ​​the first tab 42 electrically connected to the first pole post 32.

[0052] Furthermore, the first tab 42 and the second tab 43 are respectively connected to both sides of the electrode body 41 along the third direction Z. The arrangement of the first tab 42 and the second tab 43 in the above embodiment can be verified through simulation or actual operation. If the first tab 42 and the second tab 43 can meet the requirements of battery structural stability, battery charge / discharge overcurrent capacity, and heat conduction and heat dissipation capacity, the width of the first electrode post 22 and the width of the first tab 42 (the dimensions of the first electrode post 22 and the first tab 42 in the third direction Z) can be shortened, thereby reducing battery weight and increasing energy density. In other words, the specific arrangement position of the first tab 42 and the second tab 43 in the above embodiment is determined based on the performance of the first tab 42 and the second tab 43 in meeting the requirements of battery structural stability, battery charge / discharge overcurrent capacity, and heat conduction and heat dissipation capacity. This embodiment of the present invention does not limit this.

[0053] Furthermore, it should be noted that since the first tab 42 and the second tab 43 are respectively connected to both sides of the electrode body 41 along the third direction Z, and the length of the electrode body 41 along the first direction X is greater than the length of the electrode body 41 along the third direction Z, the first tab 42 and the second tab 43 can be directly disposed on the two end faces of the electrode body 41 along the third direction Z, with the first tab 42 directly connected to the first terminal 22 and the second tab 43 directly connected to the second terminal 32. This can improve the structural stability and safety of the battery when it is subjected to vibration or impact. At the same time, it can maximize the size of the contact area between the first tab 42 and the electrode body 41, improving the battery's overcurrent capacity, that is, increasing the battery's charging and discharging rates, resulting in higher input and output power. Meanwhile, the larger first tab 42 is welded to the first electrode post 22, and the first tab 42 is also welded to the larger end face of the electrode body 41. The larger second tab 43 is welded to the second electrode post 32, and the second tab 43 is also welded to the larger end face of the electrode body 41. By using the current collector to directly conduct the heat inside the battery to the first electrode post 22, heat can be quickly conducted to the outside of the battery, improving the heat conduction and heat dissipation effect of the battery and extending the battery's service life.

[0054] It should also be noted that, according to Figure 1 In this embodiment of the invention, the X-axis and Z-axis intersect, the Y-axis and Z-axis intersect, and the X-axis and Y-axis intersect. For ease of explanation, the first direction is defined as the X-axis, the second direction as the Y-axis, and the third direction as the Z-axis. Further explanation: the definition of perpendicularity in the specification should be understood as perpendicular if it fluctuates by 10% within 90 degrees; that is, the angle between the first and second directions should be understood as perpendicular if it is between 80 and 90 degrees.

[0055] The structure and specific features of the battery provided in the embodiments of this utility model will be described in detail below:

[0056] In some embodiments, the length of the second pole post 32 in the first direction X is greater than the length of the second pole post 32 in the second direction Y.

[0057] In this embodiment, analogous to the connection between the first terminal 22 and the first tab 42, since the length of the second terminal 32 in the first direction X is greater than the length of the second terminal 32 in the second direction Y, and the length of the electrode body 41 along the first direction X is greater than the length of the electrode body 41 along the third direction Z, not only is the end face of the second tab 43 in contact with the electrode body 41 the end face with the largest area in the electrode body 41, but the area of ​​the second terminal 32 can also be maximized. This increases the area occupied by the second tab 43 on the electrode body 41, thereby increasing the area of ​​the electrical connection between the second tab 43 and the second terminal 32, increasing the current carrying capacity of the second tab 43, improving the battery charge and discharge rate, and improving the structural robustness and heat dissipation effect of the battery, thus increasing the battery's service life.

[0058] In some embodiments, such as Figure 3 and Figure 4 As shown, the first pole post 22 includes a riveting part 221 and a connecting part 222. The riveting part 221 and the connecting part 222 are connected along the third direction Z. The connecting part 222 is fixedly connected to the first pole tab 42. The riveting part 221 includes a first riveting part 2211. The first riveting part 2211 is located outside the housing 1. The length of the first riveting part 2211 along the first direction X is greater than the length along the second direction Y.

[0059] In this embodiment, the first terminal post 22 includes a riveting portion 221 and a connecting portion 222, which are connected along a third direction Z. The connecting portion 222 is fixedly connected to the first electrode tab 42. The riveting portion 221 includes a first riveting portion 2211, which is located outside the housing 1. Therefore, it can be connected to the first electrode tab 42 through the connecting portion 222. The current transmitted to the first electrode tab 42 is then transferred to the riveting portion 221 through the connecting portion 222, and connected to the external circuit through the first riveting portion 2211. Furthermore, since the length of the first riveting portion 2211 along the first direction X is greater than its length along the second direction Y, the exposed surface of the first riveting portion 2211 is the end face with the largest size of the riveting portion 221, increasing the heat dissipation area of ​​the first terminal post 22 and improving the structural robustness and heat dissipation effect of the battery.

[0060] In some embodiments, such as Figure 3 and Figure 5 As shown, the riveting part 221 also includes a second riveting part 2212, which is connected to the first riveting part 2211 along the third direction Z. The second riveting part 2212 passes through the first cover plate 21 and is connected to the connecting part 222. The area of ​​the projection of the first riveting part 2211 along the third direction Z on the first cover plate 21 is greater than the area of ​​the projection of the second riveting part 2212 along the third direction Z on the first cover plate 21.

[0061] In this embodiment, the current transmitted to the connecting part 222 can be transmitted to the first riveting part 2211 through the second riveting part 2212. Furthermore, since the area of ​​the projection of the first riveting part 2211 along the third direction Z onto the first cover plate 21 is larger than the area of ​​the projection of the second riveting part 2212 along the third direction Z onto the first cover plate 21, it can be ensured that the cross-sectional area of ​​the first riveting part 2211 on the plane formed by the first direction X and the second direction Y is larger than the cross-sectional area of ​​the second riveting part 2212 on the plane formed by the first direction X and the second direction Y. In addition, since the current is transmitted along the third direction Z, it can be ensured that the surface of the first riveting part 2211 furthest from the second riveting part 2212 is the surface with the largest area among the riveting parts 221. The first riveting part 2211 not only facilitates connection with external circuits but also increases the current-carrying area when the riveting part 221 is connected to the external circuit.

[0062] In some embodiments, the first cover plate assembly 2 further includes a first insulating member 5, which abuts between the first riveting portion 2211 and the first cover plate 21.

[0063] In this embodiment, since the first insulating member 5 abuts between the first riveting part 2211 and the first cover plate 21, it can not only make the first riveting part 2211 and the first cover plate 21 insulated, but also fill the cavity between the first riveting part 2211 and the first cover plate 21, thereby improving the overall strength of the first cover plate assembly 2.

[0064] In some embodiments, such as Figure 3 and Figure 7 As shown, the first cover plate assembly 2 also includes a second insulating member 6 and a sealing member 7. The second insulating member 6 is located inside the housing 1 and is connected to the side of the first cover plate 21 near the electrode assembly 4. The sealing member 7 includes a first sealing part 71 and a second sealing part 72 connected along a third direction Z. The first sealing part 71 abuts against the first cover plate 21 and the connecting part 222 along the third direction Z. The second sealing part 72 abuts against the first cover plate 21 and the connecting part 222 along a first direction X.

[0065] In this embodiment, the first insulating member 5 and the second insulating member 6 can be materials with insulating properties such as rubber or plastic. The sealing member 7 is located between the first cover plates 21 of the electrode assembly 4. The sealing member 7 is made of insulating material, so that the current transmitted to the first electrode tab 42 can only be transmitted to the first electrode post 22 through the first electrode tab 42. Furthermore, since the sealing member 7 includes a first sealing part 71 and a second sealing part 72 connected along the third direction Z, the first sealing part 71 abuts between the first cover plate 21 and the connecting part 222 along the third direction Z, and the second sealing part 72 abuts between the first cover plate 21 and the connecting part 222 along the first direction X, the first sealing part 71 can completely insulate the first cover plate 21 and the connecting part 222, thereby ensuring that the current transmitted to the connecting part 222 can be transmitted to the outside through the riveting part 221, ensuring the stability of current transmission.

[0066] It should be noted that in the above embodiments, both the first sealing part 71 and the second sealing part 72 can be annular structures so as to surround the first pole post 22.

[0067] In some embodiments, such as Figure 3 and Figure 7 As shown, the connecting part 222 includes a first connecting part 2221 and a second connecting part 2222 connected along the third direction Z. The first connecting part 2221 is disposed close to the electrode assembly 4. The second connecting part 2222 is connected to the riveting part 221 and passes through the first cover plate 21. The area of ​​the projection of the first connecting part 2221 along the third direction Z on the first cover plate 21 is greater than the area of ​​the projection of the second connecting part 2222 along the third direction Z on the first cover plate 21.

[0068] In this embodiment, the first connecting portion 2221 is connected to the first tab 42, and the second connecting portion 2222 is connected to the riveting portion 221. Since the area of ​​the first connecting portion 2221 projected along the third direction Z onto the first cover plate 21 is larger than the area of ​​the second connecting portion 2222 projected along the third direction Z onto the first cover plate 21, and since the end face of the first tab 42 that contacts the electrode body 41 is the largest end face in the electrode body 41, the end face of the first connecting portion 2221 connected to the first tab 42 facing the first tab 42 can be made the largest end face in the connecting portion 222. This increases the electrical connection area between the first tab 42 and the first electrode post 22, increases the current-carrying area of ​​the first tab 42, improves the current-carrying capacity of the first tab 42, increases the battery charge / discharge rate, and simultaneously improves the structural robustness and heat dissipation of the battery, thus extending the battery's lifespan.

[0069] It should be noted that when the connecting part 222 includes the first connecting part 2221 and the second connecting part 2222 connected along the third direction Z, the first sealing part 71 can abut against the first cover plate 21 and the second connecting part 2222 along the third direction Z to further ensure that the current is transmitted along the direction from the connecting part 222 to the riveting part 221.

[0070] In some embodiments, there are multiple electrode components 4, which are arranged along the second direction Y, and multiple first tabs 42 are arranged along the second direction Y, and the multiple first tabs 42 are fixedly connected to the first pole post 22.

[0071] In this embodiment, since multiple electrode components 4 are arranged along the second direction Y, multiple first tabs 42 are arranged along the second direction Y, and multiple first tabs 42 are fixedly connected to the first pole post 22, the output power of the battery can be increased by multiple first tabs 42, while increasing the current transmission capability of the battery, increasing the current transmission capability of the battery and improving the connection reliability.

[0072] In some embodiments, such as Figure 5 As shown, the battery also includes an explosion-proof valve 8, which is mounted on the housing 1. The number of explosion-proof valves 8 is greater than or equal to one. This allows the explosion-proof valve 8 to quickly rupture and release the pressure inside the housing 1 in the event of abnormal conditions such as thermal runaway, preventing the battery from exploding and ensuring battery safety. It should be noted that the housing 1 can also be provided with a pressure relief hole communicating with the receiving cavity. The explosion-proof valve 8 is mounted on the housing 1 and covers the pressure relief hole, which is connected to the receiving cavity. The explosion-proof valve 8 then covers the cavity, thus achieving the function of ensuring battery safety.

[0073] In some possible implementations, the battery also includes an insulating film layer located inside the housing 1, which covers the electrode assembly 4. The insulating film layer has multiple heat dissipation holes. In this way, the heat generated by the electrode assembly 4 can be directly transferred to the housing 1 through the heat dissipation holes, thereby transferring the heat from the electrode assembly 4 to the housing 1 and dissipating it to the outside of the battery, thus increasing the heat dissipation effect.

[0074] As can be seen from the above embodiments, in this embodiment of the present invention, since the length of the electrode body 41 along the first direction X is greater than the length of the electrode body 41 along the third direction Z, and the length of the first electrode post 22 in the first direction X is greater than the length of the first electrode post 22 in the second direction Y, not only is the end face of the first tab 42 in contact with the electrode body 41 the end face with the largest area in the electrode body 41, but the setting area of ​​the first electrode post 22 can also be maximized. This increases the area occupied by the first tab 42 on the electrode body 41, thereby increasing the area of ​​the electrical connection between the first tab 42 and the first electrode post 22, increasing the current carrying capacity of the first tab 42, improving the battery charge and discharge rate, and improving the structural robustness and heat dissipation effect of the battery, thus increasing the battery's service life.

[0075] Furthermore, this embodiment of the invention also provides a battery pack, which includes the battery described in any of the above embodiments. The beneficial effects of this battery pack are the same as those of the batteries described above, and will not be repeated here.

[0076] The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0077] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0078] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0079] The present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery, characterized in that, The battery has a first direction (X), a second direction (Y), and a third direction (Z) that intersect each other in pairs, and the battery includes: The housing has a first opening and a second opening at both ends along the third direction (Z); The first cover plate assembly includes a first cover plate that covers the first opening and is connected to the housing, and a first pole post is provided through the first cover plate; The second cover plate assembly includes a second cover plate that covers the second opening and is connected to the housing, and a second pole post is provided through the second cover plate; An electrode assembly is disposed within the housing. The electrode assembly includes an electrode body, a first electrode tab, and a second electrode tab. The first electrode tab and the second electrode tab are respectively connected to the two sides of the electrode body along the third direction (Z). The length of the electrode body along the first direction (X) is greater than the length of the electrode body along the third direction (Z). The first pole post is fixedly connected to the first pole tab, and the second pole post is fixedly connected to the second pole tab. The length of the first pole post in the first direction (X) is greater than the length of the first pole post in the second direction (Y).

2. The battery according to claim 1, characterized in that, The length of the second pole in the first direction (X) is greater than the length of the second pole in the second direction (Y).

3. The battery according to claim 1, characterized in that, The first pole post includes a riveting part and a connecting part, the riveting part and the connecting part are connected along the third direction (Z), the connecting part is fixedly connected to the first pole lug, the riveting part includes a first riveting part, the first riveting part is located outside the housing, and the length of the first riveting part along the first direction (X) is greater than the length along the second direction (Y).

4. The battery according to claim 3, characterized in that, The riveting part further includes a second riveting part, which is connected to the first riveting part along the third direction (Z). The second riveting part passes through the first cover plate and is connected to the connecting part. The area of ​​the projection of the first riveting part onto the first cover plate along the third direction (Z) is greater than the area of ​​the projection of the second riveting part onto the first cover plate along the third direction (Z).

5. The battery according to claim 4, characterized in that, The first cover plate assembly further includes a first insulating member, which abuts against the first riveted portion and the first cover plate.

6. The battery according to claim 5, characterized in that, The first cover plate assembly further includes a second insulating member and a sealing member. The second insulating member is located inside the housing and is connected to the side of the first cover plate near the electrode assembly. The sealing member includes a first sealing portion and a second sealing portion connected along the third direction (Z). The first sealing portion abuts between the first cover plate and the connecting portion along the third direction (Z), and the second sealing portion abuts between the first cover plate and the connecting portion along the first direction (X).

7. The battery according to claim 3, characterized in that, The connecting portion includes a first connecting portion and a second connecting portion connected along the third direction (Z), the first connecting portion being disposed close to the electrode assembly, and the second connecting portion being connected to the riveting portion; The area of ​​the projection of the first connecting part along the third direction (Z) onto the first cover plate is greater than the area of ​​the projection of the second connecting part along the third direction (Z) onto the first cover plate.

8. The battery according to any one of claims 1-7, characterized in that, The number of electrode assemblies is multiple, the multiple electrode assemblies are arranged along the second direction (Y), the multiple first electrode tabs are arranged along the second direction (Y), and the multiple first electrode tabs are fixedly connected to the first electrode post.

9. The battery according to any one of claims 1-7, characterized in that, The battery also includes an explosion-proof valve; The explosion-proof valve is mounted on the housing; Alternatively, the battery may further include an insulating film layer located inside the housing, the insulating film layer covering the electrode assembly, and the insulating film layer having multiple heat dissipation holes extending through it.

10. A battery pack, characterized in that, Includes the battery according to any one of claims 1-9.

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