Battery and battery pack

Abstract

The utility model relates to power battery technical field provides a kind of battery and battery pack.Battery includes first shell, top cover, pole group, pole, explosion-proof valve and bar sheet;The top of first shell is equipped with opening, the bottom wall of first shell is equipped with protruding structure, protruding structure is formed with the contact surface for contacting with the structural member of battery pack;Top cover is located in opening;Pole is located in the bottom wall of first shell;Explosion-proof valve is located in the bottom wall of first shell;The inner wall of bar sheet is connected with pole, the outer wall of bar sheet is coplanar with contact surface.The utility model can improve the stability of battery in battery pack, improve the overall structural strength of battery pack, and improve the capacity of battery.At the same time, inverted battery can be formed, when battery thermal runaway, flammable material is ejected downward, to avoid the threat to passenger compartment.In addition, the structural member (such as liquid cooling plate) of battery pack can be contacted with the contact surface of bar sheet and protruding structure at the same time, while optimizing the stress capacity of pole side, the heat dissipation capacity of battery can also be improved.

Description

Technical Field

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

[0002] A power battery is a rechargeable battery used to power devices such as electric vehicles, primarily by storing and releasing electrical energy to drive an electric motor.

[0003] In existing technologies, the highest point of a battery (cell) is typically located on the terminal post of the cover plate. To ensure sufficient safety performance, batteries are generally protected from excessive external forces within the battery pack, a design that helps prevent damage to the internal structure. However, this design also results in lower overall strength of the battery pack, potentially affecting its stability and safety under external impacts or pressure. Utility Model Content

[0004] This invention provides a battery and a battery pack to address the shortcomings of existing battery packs, which have low overall strength and may affect their stability and safety when subjected to external impacts or pressure.

[0005] This utility model provides a battery, including: a first casing, a top cover, terminals, an explosion-proof valve, and a battery plate.

[0006] Along the height direction of the battery, the top of the first housing is provided with an opening, and the bottom wall of the first housing is provided with a protruding structure, the protruding structure forming a contact surface for contacting structural components of the battery pack; the top cover is provided at the opening; the terminal post is provided at the bottom wall of the first housing; the explosion-proof valve is provided at the bottom wall of the first housing; along the height direction of the battery, the inner wall of the electrode is connected to the terminal post, and the outer wall of the electrode is coplanar with the contact surface.

[0007] According to the battery provided by this utility model, the protruding structure is integrally formed with the bottom wall of the first housing, and along the height direction of the battery, the bottom wall of the first housing has a receiving groove corresponding to the inner side of the protruding structure.

[0008] The battery provided by this utility model further includes: an electrode assembly and a connecting piece, wherein the electrode assembly is disposed in the first housing, and the connecting piece includes a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to the second connecting portion, the first connecting portion is connected to the electrode tab of the electrode assembly, the second connecting portion is connected to the electrode post, and at least a portion of the first connecting portion is located in the receiving groove.

[0009] According to the battery provided by this utility model, the inner axial end of the electrode post is provided with a slot, and at least a portion of the second connecting part is located in the slot and engages with the slot to restrict the circumferential rotational freedom of the connecting piece in the initial state.

[0010] According to the battery provided by this utility model, the depth W of the slot along the height direction of the battery is 3.6mm≤W≤4mm.

[0011] According to the battery provided by this utility model, along the height direction of the battery, the thickness G of the terminal corresponding to the slot is 0.6mm≤G≤(W-2.6)mm.

[0012] According to the battery provided by this utility model, the tabs of the electrode assembly are at least partially located within the receiving groove.

[0013] According to the battery provided by this utility model, along the length direction of the battery, the bottom wall of the first housing is provided with two protruding structures spaced apart, the explosion-proof valve is located between the two protruding structures, and the pole post is provided on the outer side of each of the two protruding structures.

[0014] According to the battery provided by this utility model, the top cover is provided with a liquid injection port.

[0015] Another aspect of this utility model provides a battery pack, including: a second housing and a plurality of batteries, wherein the batteries are disposed within the second housing.

[0016] The battery and battery pack provided by this utility model, by setting a protruding structure on the bottom wall of the first housing, can contact the structural components of the battery pack (such as liquid cooling plates) to provide support and fixation for the battery, improving the stability of the battery within the battery pack and enhancing the overall structural strength of the battery pack. Furthermore, because the battery can bear loads, the clearance space between the battery and the structural components of the battery pack can be eliminated, increasing the overall height of the battery and thus increasing its capacity. Simultaneously, the explosion-proof valve is positioned downwards on the bottom wall of the first housing, forming an inverted battery. In the event of thermal runaway, flammable materials are ejected downwards, preventing a threat to the passenger compartment. Additionally, along the height direction of the battery, by connecting the inner wall of the diaphragm to the terminal post and making the outer wall of the diaphragm coplanar with the contact surface, the structural components of the battery pack (such as liquid cooling plates) can simultaneously contact the contact surfaces of the diaphragm and the protruding structure, optimizing the load-bearing capacity on the terminal post side and improving the battery's heat dissipation capacity.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in 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 utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is one of the schematic diagrams of the battery provided in this embodiment of the utility model.

[0020] Figure 2 This is a second schematic diagram of the battery provided in this embodiment of the present invention.

[0021] Figure 3 yes Figure 2 A magnified view of part A in the diagram.

[0022] Figure 4 This is a schematic diagram of the battery pack provided in an embodiment of the present invention.

[0023] Figure label: 110. First housing; 111. Protruding structure; 1111. Contact surface; 1112. Receiving groove; 120. Top cover; 121. Liquid injection port; 130. Electrode assembly; 140. Electrode post; 141. Slot; 150. Explosion-proof valve; 160. Bar plate; 170. Connecting piece; 171. First connecting part; 172. Second connecting part; 180. Liquid cooling plate. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0027] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] The following is combined with Figures 1 to 4 This invention describes the battery and battery pack provided by this utility model.

[0030] See Figures 1 to 3 As shown, the battery provided in this embodiment of the present invention includes: a first housing 110, a top cover 120, an electrode group 130, an electrode post 140, an explosion-proof valve 150, and a valve plate 160.

[0031] Along the height direction of the battery, the top of the first housing 110 is provided with an opening, and the bottom wall of the first housing 110 is provided with a protruding structure 111, the protruding structure 111 forming a contact surface 1111 for contacting the structural components of the battery pack; the top cover 120 is provided at the opening; the electrode group 130 is provided inside the first housing 110; the electrode post 140 is provided on the bottom wall of the first housing 110; the explosion-proof valve 150 is provided on the bottom wall of the first housing 110; along the height direction of the battery, the inner wall of the electrode 160 is connected to the electrode post 140, and the outer wall of the electrode 160 is coplanar with the contact surface 1111.

[0032] The battery and battery pack provided by this utility model, by providing a protruding structure 111 on the bottom wall of the first housing 110, can contact the structural components of the battery pack (such as the liquid cooling plate 180) to provide support and fixation for the battery, thereby improving the stability of the battery within the battery pack and enhancing the overall structural strength of the battery pack. Furthermore, because the battery can bear loads, the clearance space between the battery and the structural components of the battery pack can be eliminated, and the overall height of the battery can be increased to improve its capacity. Simultaneously, the explosion-proof valve 150 is disposed on the bottom wall of the first housing 110 facing downwards, forming an inverted battery. In the event of thermal runaway of the battery, flammable materials are ejected downwards, preventing a threat to the passenger compartment. In addition, by connecting the inner wall of the plate 160 to the terminal post 140 along the height direction of the battery and making the outer wall of the plate 160 coplanar with the contact surface 1111, the structural components of the battery pack (such as the liquid cooling plate 180) can simultaneously contact the contact surface 1111 of the plate 160 and the protruding structure 111. This optimizes the force-bearing capacity of the terminal post 140 while also improving the heat dissipation capacity of the battery.

[0033] Specifically, see Figures 1 to 3 As shown, the battery provided by this utility model includes a first housing 110, a top cover 120, an electrode assembly 130, a terminal post 140, an explosion-proof valve 150, and a switch plate 160. The first housing 110 has a cavity for accommodating the electrode assembly 130 and electrolyte. The top cover 120 is located at the top opening of the first housing 110 to seal the cavity. The electrode assembly 130 is located within the cavity and can form an electrochemical system with the electrolyte. The terminal post 140 is electrically connected to the tabs of the electrode assembly 130 via a connecting piece 170 to guide current from the positive and negative terminals of the battery into an external circuit, thereby realizing the battery's energy output. The explosion-proof valve 150 releases internal pressure in case of overpressure or overheating, preventing the battery from exploding or catching fire due to excessive internal pressure. The switch plate 160 connects multiple battery cells in series and provides an efficient current transmission path. In addition, the pole post 140, the inner insulating support pad, the outer insulating support pad and the sealing ring are fixed to the bottom wall of the first housing 110 by reverse mortise and tenon joint. That is, in this embodiment, the pole post adopts a structure integrated into the bottom wall of the first housing.

[0034] The bottom wall of the first housing 110 is provided with a protruding structure 111. When the battery is used in a battery pack, the protruding structure 111 can serve as a support for structural components of the battery pack (such as the liquid cooling plate 180), protecting the positive and negative terminals 140. Simultaneously, the contact surface 1111 of the protruding structure 111 has a certain heat dissipation area, allowing the battery to exchange heat with the liquid cooling plate 180 of the battery pack, thereby improving heat exchange efficiency. The protruding structure 111 can be an independent component, installed on the bottom wall of the first housing 110 by welding or other methods. Alternatively, the protruding structure 111 can be integrally formed with the bottom wall of the first housing 110. During processing, the protruding structure 111 with a certain structural strength can be formed on the bottom wall of the first housing 110 in a single stamping process, simplifying manufacturing.

[0035] It is understood that the number of protruding structures 111 on the bottom wall of the first housing 110 is at least one, that is, it includes both single and multiple forms. The specific arrangement depends on the layout of components such as the pole post 140 and the explosion-proof valve 150 on the bottom wall of the first housing 110, as well as the required support contact area. For example, when the plane space occupied by components such as the pole post 140 and the explosion-proof valve 150 on the bottom wall of the first housing 110 is large, only a single protruding structure 111 can be set on the bottom wall of the first housing 110 to meet the space layout requirements. Conversely, multiple protruding structures 111 can be set to distribute the force through multiple protruding structures 111, thereby optimizing the stress conditions when the battery is applied to the battery pack.

[0036] It should be noted that when multiple protrusions 111 are provided on the bottom wall of the first housing 110, the height of the multiple protrusions 111 must be the same to satisfy the condition that the contact surfaces 1111 of the multiple protrusions 111 can simultaneously contact the structural components of the battery pack.

[0037] Furthermore, when multiple protrusions 111 are provided on the bottom wall of the first housing 110, the outer contours of the different protrusions 111 can be the same or different, and there is no special limitation on this. For example, some of the protrusions 111 have a square outer contour, and some of the protrusions 111 have a circular outer contour, etc.

[0038] As an example, in this embodiment, the bottom wall of the first housing 110 is provided with two square-shaped protrusions 111. The two protrusions 111 have the same overall height and are spaced apart along the length of the battery. In this way, the two protrusions 111 can simultaneously contact the structural components of the battery pack, and also allow installation space for components such as the terminal post 140 and the explosion-proof valve 150.

[0039] See Figures 1 to 3As shown, according to some embodiments of the present invention, the protruding structure 111 is integrally formed with the bottom wall of the first housing 110, and along the height direction of the battery, the bottom wall of the first housing 110 forms a receiving groove 1112 corresponding to the inner side of the protruding structure 111.

[0040] By forming a receiving groove 1112 on the inner side of the bottom wall of the first housing 110 corresponding to the protrusion 111, the receiving groove 1112 can accommodate components or structures such as the battery connecting piece 170 and the electrode tabs of the electrode assembly 130, avoiding the connecting piece 170 and the electrode tabs occupying additional space, thereby improving the space utilization rate of the battery. At the same time, it can also increase the internal storage space of the battery to meet the needs of accommodating more electrolyte. That is, based on adapting to the structural characteristics of the protrusion 111, the spatial layout of the battery can be optimized and the space utilization rate can be improved.

[0041] Of course, in addition to the connecting piece 170, the depth and dimensions of the receiving groove 1112 can also be used to accommodate other components / structures inside the first battery casing 110, without any special limitations.

[0042] See Figures 1 to 3 As shown, according to some embodiments of the present invention, the battery further includes: a connecting piece 170, the connecting piece 170 including a first connecting portion 171 and a second connecting portion 172, the first connecting portion 171 being connected to the second connecting portion 172, the first connecting portion 171 being connected to the tab of the electrode assembly 130, the second connecting portion 172 being connected to the electrode post 140, and at least a portion of the first connecting portion 171 being located in the receiving groove 1112.

[0043] By providing the connecting piece 170, the terminal post 140 can be electrically connected to the tab of the electrode assembly 130. At the same time, at least a portion of the first connecting part 171 is located within the receiving groove 1112, which eliminates the need for the first connecting part 171 to occupy additional space inside the battery, thereby improving the space utilization rate of the battery.

[0044] See Figures 1 to 3 As shown, according to some embodiments of the present invention, the tabs of the electrode assembly 130 are at least partially located within the receiving groove 1112.

[0045] By placing at least a portion of the tabs of the electrode assembly 130 within the receiving groove 1112, the additional space occupied by the tabs inside the battery can also be eliminated, thereby improving the space utilization of the battery.

[0046] See Figures 1 to 3 As shown, according to some embodiments of the present invention, the inner axial end of the pole post 140 is provided with a groove 141, and at least a portion of the second connecting part 172 is located in the groove 141 and engages with the groove 141 to restrict the circumferential rotational freedom of the connecting piece 170 in the initial state.

[0047] By providing a groove 141 at the axial inner end of the pole post 140, and by placing at least a portion of the second connecting portion 172 within and engaging with the groove 141, the circumferential rotational freedom of the connecting piece 170 can be restricted in the initial state, preventing the connecting piece 170 from rotating relative to the pole post 140 in the initial state. Simultaneously, it also provides a certain degree of torsional resistance after the second connecting portion 172 of the connecting piece 170 is welded to the axial inner end of the pole post 140, reducing the risk of welding failure.

[0048] Specifically, to restrict the circumferential rotational freedom of the connecting piece 170, the slot 141 is preferably configured as a slot shape other than a circular slot, such as a square or triangular slot. For example, in this embodiment, the slot 141 is a square slot, and the second connecting part 172 is correspondingly provided with a square engaging part.

[0049] It should be noted that the "initial state" mentioned above specifically refers to the state when the connecting piece 170 and the pole post 140 are initially fixed and have not yet been welded.

[0050] See Figure 3 As shown, according to some embodiments of the present invention, the depth W of the slot 141 along the height direction of the battery is 3.6mm≤W≤4mm.

[0051] By setting the depth W of the slot 141 to 3.6mm≤W≤4mm along the height direction of the battery, the effectiveness of the engagement between the second connecting part 172 and the slot 141 can be ensured, preventing the second connecting part 172 from coming out of the slot 141 if the slot 141 is too shallow. It also avoids the excessive thickness requirement for the terminal post 140 when the slot 141 is too deep.

[0052] As an example, the depth W of the card slot 141 can be 3.6mm, 3.8mm, or 4mm, etc.

[0053] See Figure 3 As shown, according to some embodiments of the present invention, along the height direction of the battery, the thickness G of the terminal post 140 at the corresponding slot 141 is 0.6mm≤G≤(W-2.6)mm.

[0054] Along the height direction of the battery, by setting the thickness G at the slot 141 corresponding to the terminal post 140 to 0.6mm≤G≤(W-2.6)mm, it can ensure that the area has a certain thickness and structural strength, avoid deformation of the connecting piece 170, and at the same time avoid the thickness G at the slot 141 corresponding to the terminal post 140 being too large, which would prevent the subsequent through-welding from penetrating through the area.

[0055] Specifically, when the depth W of the slot 141 is 3.6mm, the thickness G of the pole post 140 at the slot 141 is 0.6mm≤G≤1mm; when the depth W of the slot 141 is 4mm, the thickness G of the pole post 140 at the slot 141 is 0.6mm≤G≤1.4mm.

[0056] As an example, the thickness G of the pole post 140 at the corresponding slot 141 can be 0.6mm, 0.7mm, 0.8mm, 1mm, 1.3mm or 1.4mm, etc.

[0057] The experimental verification parameters are set as shown in Table 1 below.

[0058] Table 1: Experimental parameters for Examples 1 to 4 and Comparative Examples 1 to 3.

[0059] In Examples 1 to 4, five batteries were randomly selected for assembly in each example. The assembly process was normal, and the dimensional fit was reasonable and did not affect the assembly. In Comparative Examples 1 to 3, five batteries were also randomly selected for assembly in each example. In Comparative Example 1, the thickness G at the slot 141 corresponding to the terminal post 140 was too large, which made it impossible to weld the terminal post 140 to the connecting piece 170 using through welding, resulting in welding difficulties. In Comparative Example 2, the thickness G at the slot 141 corresponding to the terminal post 140 was too small, and the connecting piece 170 was deformed due to the welding heat, which did not meet the usage requirements. In Comparative Example 3, the thickness G at the slot 141 corresponding to the terminal post 140 did not meet the requirement of 0.6mm≤G≤(W-2.6)mm, which caused the connecting piece 170 to twist and deform.

[0060] See Figure 1 As shown, according to some embodiments of the present invention, along the length direction of the battery, the bottom wall of the first housing 110 is provided with two protruding structures 111 spaced apart, the explosion-proof valve 150 is located between the two protruding structures 111, and the outer side of each of the two protruding structures 111 is provided with a pole post 140.

[0061] Along the length of the battery, two protruding structures 111 are spaced apart on the bottom wall of the first housing 110. These two protruding structures 111 can simultaneously contact the structural components of the battery pack, dispersing the load and optimizing the stress conditions when the battery is applied to the battery pack. This prevents excessive stress on a single protruding structure 111, which could lead to deformation or damage. Simultaneously, an explosion-proof valve 150 is positioned between the two protruding structures 111, and two terminals 140 are respectively positioned on the outer side of the protruding structures 111 along the length of the battery. The protruding structures 111 separate the explosion-proof valve 150 and the terminals 140, achieving thermoelectric separation. This prevents the explosion-proof valve 150 from affecting the electrical connections of the terminals 140 when it is activated, and also prevents the heat generated by the terminals 140 during operation from affecting the explosion-proof valve 150.

[0062] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the top cover 120 is provided with an injection port 121.

[0063] By providing an injection port 121 on the top cover 120, electrolyte can be injected into the first housing 110 through the injection port 121, and the injection process is not affected when the battery is inverted.

[0064] The battery pack provided by this utility model is described below. The battery pack described below can be referred to in correspondence with the battery described above.

[0065] See Figure 4 As shown, the battery pack provided in this embodiment of the present invention includes: a second housing (not shown in the figure) and a plurality of batteries, the batteries being disposed inside the second housing.

[0066] The battery pack provided by this utility model, because it uses the battery described in any of the preceding embodiments, can also utilize the protruding structure 111 to contact the structural components of the battery pack (such as the liquid cooling plate 180) to provide support and fixation for the battery, thereby improving the stability of the battery within the battery pack and enhancing the overall structural strength of the battery pack. Furthermore, since the battery can bear loads, the clearance space between the battery and the structural components of the battery pack can be eliminated, and the overall height of the battery can be increased to enhance its capacity. Simultaneously, the explosion-proof valve 150 is disposed on the bottom wall of the first housing 110 facing downwards, forming an inverted battery. In the event of thermal runaway of the battery, flammable materials are ejected downwards, preventing a threat to the passenger compartment. In addition, by connecting the inner wall of the plate 160 to the terminal post 140 along the height direction of the battery and making the outer wall of the plate 160 coplanar with the contact surface 1111, the structural components of the battery pack (such as the liquid cooling plate 180) can simultaneously contact the contact surface 1111 of the plate 160 and the protruding structure 111. This optimizes the force-bearing capacity of the terminal post 140 while also improving the heat dissipation capacity of the battery.

[0067] It should be noted that, since the battery is an inverted battery, when it is used in a battery pack and in a car, the explosion-proof valve 150 must be positioned facing away from the passenger compartment.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery, characterized in that, include: The first housing has an opening at the top along the height direction of the battery, and a protruding structure on the bottom wall of the first housing, the protruding structure forming a contact surface for contacting structural components of the battery pack. Top cover, the top cover being disposed at the opening; The electrode post is disposed on the bottom wall of the first housing; An explosion-proof valve is disposed on the bottom wall of the first housing; The electrode pad has its inner wall connected to the terminal post along the height direction of the battery, and its outer wall is coplanar with the contact surface.

2. The battery according to claim 1, characterized in that, The protruding structure is integrally formed with the bottom wall of the first housing, and along the height direction of the battery, the bottom wall of the first housing and the inner side corresponding to the protruding structure form a receiving groove.

3. The battery according to claim 2, characterized in that, Also includes: A pole assembly, wherein the pole assembly is disposed within the first housing; The connecting piece includes a first connecting portion and a second connecting portion that are connected to each other. The first connecting portion is connected to the tab of the electrode group, and the second connecting portion is connected to the pole post. At least a portion of the first connecting portion is located in the receiving groove.

4. The battery according to claim 3, characterized in that, The pole post has a groove at its axial inner end, and at least a portion of the second connecting part is located in the groove and engages with the groove to restrict the circumferential rotational freedom of the connecting piece in the initial state.

5. The battery according to claim 4, characterized in that, Along the height direction of the battery, the depth W of the slot is 3.6mm≤W≤4mm.

6. The battery according to claim 5, characterized in that, Along the height direction of the battery, the thickness G of the terminal corresponding to the slot is 0.6mm≤G≤mm.

7. The battery according to claim 3, characterized in that, The tabs of the electrode assembly are at least partially located within the receiving groove.

8. The battery according to any one of claims 1 to 7, characterized in that, Along the length of the battery, the bottom wall of the first housing is provided with two protruding structures spaced apart, the explosion-proof valve is located between the two protruding structures, and the pole post is provided on the outer side of each of the two protruding structures.

9. The battery according to any one of claims 1 to 7, characterized in that, The top cover is equipped with an injection port.

10. A battery pack, characterized in that, include: Second shell; Multiple batteries as described in any one of claims 1 to 9, wherein the batteries are disposed within the second housing.

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