Battery and battery module

Abstract

The utility model discloses a battery and a battery assembly. The battery comprises a shell, a first pole, an insulating part and a busbar, the shell comprises a shell part and a limiting part, the shell part comprises a first side wall, a second side wall and a third side wall, the first side wall and the second side wall are arranged in the thickness direction of the battery, the third side wall is located between the first side wall and the second side wall, the shell part is provided with a containing cavity, the surface, facing the containing cavity, of the third side wall is a first surface, and the limiting part is connected to the first surface; the first pole penetrates through the third side wall; the insulating part is connected to the first surface, and the limiting part is connected to the insulating part to limit rotation of the insulating part; the busbar is connected to a side of the insulator facing away from the first surface. The limiting part is connected to the insulating part and used for limiting rotation of the insulating part. Therefore, when the battery is subjected to external interference, the risk that the insulating part rotates relative to the third side wall can be effectively reduced, so that the risk that the insulating part extrudes the first side wall and the second side wall is reduced, and the risk that the battery shell is damaged is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field, especially a kind of battery and battery assembly. BACKGROUND

[0002] Some hard-shell batteries usually include a housing, a first pole piece, a second pole piece, a first pole post, a second pole post and a busbar, wherein the first pole post is electrically connected to the housing, the second pole post is insulatedly connected to the housing and connected to the busbar, and the busbar is used to be welded with the internal tab to be electrically connected to the second pole piece. Some technologies set an insulating piece between the busbar and the housing, and the insulating piece is riveted to the housing together with the pole post, thereby avoiding short circuit of the battery. However, since the insulating piece is usually a long strip structure, its length is greater than the thickness of the battery, so during the impact on the battery, the insulating piece may be deflected to press the two side walls in the thickness direction of the battery, thereby increasing the risk of damage to the battery housing. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery, which can reduce the risk of damage to the battery housing.

[0004] The utility model further provides a battery assembly comprising the above battery.

[0005] According to the battery of the first aspect of the utility model, the battery comprises a housing, a first pole post, an insulating piece and a busbar.

[0006] The housing comprises a shell portion and a limiting portion, the shell portion comprises a first side wall and a second side wall arranged in the thickness direction of the battery, and a third side wall located between the first side wall and the second side wall, the shell portion has a receiving cavity, the surface of the third side wall facing the receiving cavity is a first surface, and the limiting portion is connected to the first surface; the first pole post is arranged through the third side wall; the insulating piece is connected to the first surface, and the limiting portion is connected to the insulating piece to limit the rotation of the insulating piece; and the busbar is connected to the side of the insulating piece away from the first surface and electrically connected to the first pole post.

[0007] According to the battery of the utility model embodiment, at least the following beneficial effects are achieved:

[0008] In the embodiment, the third side wall of the housing is provided with a limiting portion, the limiting portion is connected to the insulating piece to limit the rotation of the insulating piece. Therefore, when the battery is disturbed by the outside, the risk of rotation of the insulating piece relative to the third side wall can be effectively reduced, thereby reducing the risk of the insulating piece pressing the first side wall and the second side wall, and further reducing the risk of damage to the battery housing.

[0009] According to some embodiments of the present application, the connecting relationship between the limiting part and the insulating part is plug-in connection.

[0010] According to some embodiments of the present application, the limiting part protrudes from the first surface, the insulating part has a first plug-in hole, and the limiting part is plugged into the first plug-in hole.

[0011] According to some embodiments of the present application, the insulating part comprises an insulating part and a connecting part, the busbar is connected to the side of the insulating part away from the first surface, the connecting part is connected to the insulating part and protrudes from the surface of the insulating part away from the first surface, and the connecting part has the first plug-in hole.

[0012] According to some embodiments of the present application, the surface of the third side wall opposite to the first surface further has a receiving groove, and the receiving groove extends to the limiting part.

[0013] According to some embodiments of the present application, the limiting part and the receiving groove are formed by punching towards the first surface via the third side wall.

[0014] According to some embodiments of the present application, the wall thickness of the third side wall is t, the size of the limiting part is h along the thickness direction of the third side wall, and t≤h≤5t.

[0015] According to some embodiments of the present application, the insulating part has a clamping groove, the busbar is arranged in the clamping groove, and the busbar abuts against the side wall of the clamping groove.

[0016] According to the battery assembly of the second aspect of the present application, the PCB board is arranged on the surface of the third side wall opposite to the first surface.

[0017] According to the battery assembly of the present application, at least the following beneficial effects are achieved:

[0018] The battery of the first aspect of the present application is adopted, in the present embodiment, the third side wall of the shell is provided with a limiting part, the limiting part is connected to the insulating part, and is used for limiting the rotation of the insulating part. Therefore, when the battery is disturbed by the outside world, the risk of rotation of the insulating part relative to the third side wall can be effectively reduced, thereby reducing the risk of extrusion of the insulating part to the first side wall and the second side wall, and further reducing the risk of damage of the battery shell, and improving the performance of the battery assembly of the present embodiment.

[0019] According to the battery assembly of some embodiments of the present application, the surface of the third side wall opposite to the first surface further has a receiving groove, and the receiving groove extends to the limiting part.

[0020] The PCB board comprises a substrate and a plurality of components connected to the substrate, and at least part of the components are accommodated in the accommodating groove.

[0021] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in conjunction with the drawings and examples, wherein:

[0023] Figure 1 Structure diagram of the first battery of the first aspect of the present application;

[0024] Figure 2 Structure diagram of the second battery of the first aspect of the present application; Figure 1 Sectional view of the second battery of the first aspect of the present application;

[0025] Figure 3 Structure diagram of the third battery of the first aspect of the present application; Figure 1 Sectional view of the third battery of the first aspect of the present application;

[0026] Figure 4 Enlarged view of the A area in the third battery of the first aspect of the present application; Figure 2

[0027] Structure diagram of the fourth battery of the first aspect of the present application; Figure 5

[0028] Sectional view of the fourth battery of the first aspect of the present application; Figure 6 Figure 5 Enlarged view of the B area in the fourth battery of the first aspect of the present application;

[0029] Figure 7 Figure 6 Structure diagram of the fifth battery of the first aspect of the present application;

[0030] Figure 8 Sectional view of the fifth battery of the first aspect of the present application;

[0031] Figure 9 Enlarged view of the C area in the fifth battery of the first aspect of the present application; Figure 8

[0032] Structure diagram of the sixth battery of the first aspect of the present application; Figure 10 Figure 9 Enlarged view of the insulating piece and busbar in the sixth battery of the first aspect of the present application.

[0033] Figure 11 Figure 2

[0034] REFERENCE NUMERALS:

[0035] ​​​​​Housing 100, bottom shell 101, cover plate 102, shell part 110, first side wall 111, second side wall 112, third side wall 113, first surface 1131, second surface 1132, containing cavity 114, limiting part 120, second plug hole 121, boss 130, containing groove 140;

[0036] First pole 200;

[0037] Insulating part 300, insulating part 310, connecting part 320, first plug hole 321, plug part 330, clamping groove 340;

[0038] Busbar 400, battery cell 500, second pole 600. DETAILED DESCRIPTION

[0039] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0040] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0041] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0042] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0043] Some hard-shell batteries typically include a casing, a first electrode, a second electrode, a first terminal, a second terminal, and a busbar. The first terminal is electrically connected to the casing, and the second terminal is insulated from the casing and connected to the busbar. The busbar is used to weld to internal tabs for electrical connection to the second electrode. In some technologies, an insulator is placed between the busbar and the casing, and the insulator and the terminal are riveted together to the casing to prevent short circuits. However, since the insulator is usually a long strip structure, its length exceeding the battery thickness, there is a possibility that, during an impact, the insulator may deflect and compress the two sidewalls in the thickness direction of the battery, increasing the risk of casing damage.

[0044] Once the casing is damaged, many adverse effects will occur, such as: (1) the electrolyte is easily leaked out. The electrolyte contains corrosive substances, which may cause irritation and damage to the skin, eyes, etc. (2) if the casing is broken and the positive and negative electrodes come into direct contact, it may cause a short circuit, which may cause the battery to heat up rapidly. In severe cases, it may cause the battery to explode. (3) After the lithium battery casing is broken, the electrical energy inside the battery may leak out. This not only wastes electrical energy, but may also pose a potential threat to the safety of the user.

[0045] In view of the above background, this utility model proposes a battery. This embodiment uses a steel-cased battery as an example for illustration, but it should not be interpreted as meaning that this utility model can only be a steel-cased battery; it can also be an aluminum-cased battery or other rigid-cased batteries. (Refer to...) Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of the first type of battery according to the first aspect of this utility model. Figure 2 for Figure 1 sectional view, Figure 3 for Figure 1 Explosion diagram, Figure 4 for Figure 2 An enlarged view of region A in this embodiment shows the battery, which includes: a casing 100, a first terminal post 200, an insulating component 300, and a busbar 400.

[0046] The outer casing 100 includes a casing portion 110 and a limiting portion 120. The casing portion 110 includes a first sidewall 111 and a second sidewall 112 disposed along the thickness direction of the battery, and a third sidewall 113 located between the first sidewall 111 and the second sidewall 112 (e.g., ...). Figure 3 (As shown). The shell portion 110 has a receiving cavity 114, and the surface of the third sidewall 113 facing the receiving cavity 114 is a first surface 1131. A limiting portion 120 is connected to the first surface 1131. An insulating member 300 is connected to the first surface 1131, and the limiting portion 120 is connected to the insulating member 300 to restrict the rotation of the insulating member 300 (e.g., ...). Figure 4The bus bar 400 is connected to the side of the insulating member 300 away from the first surface 1131 and is electrically connected to the first pole 200.

[0047] Specifically, the shell 100 is, for example, a steel shell 100 or an aluminum shell 100, and the third side wall 113 is, for example, a side wall along the length direction of the battery or a side wall along the width direction of the battery. The battery further includes a cell 500, a first tab, and a second tab, the cell 500 includes a first pole and a second pole, and the cell 500 is, for example, a jelly-roll cell 500 or a stacked cell 500. The cell 500 is disposed in the accommodation cavity 114, one end of the first tab is connected to the first pole, and the other end of the first tab is welded to the bus bar 400. One end of the second tab is connected to the second pole, and the other end of the second tab is welded to the inner wall of the accommodation cavity 114. The first pole 200 can be a positive pole or a negative pole. Taking a steel shell lithium battery as an example, the first pole 200 is a positive pole, the first tab is a positive tab, the first pole is a cathode pole, the shell 100 has a mounting hole, the first pole 200 is disposed in the mounting hole, and an insulating sleeve is provided outside the first pole 200 to insulate the first pole 200 from the shell 100. Correspondingly, the second pole 600 is a negative pole, the second pole 600 is welded to the outer wall of the third side wall 113, the second pole is an anode pole, and the second tab is connected to the shell 100 as a negative tab to make the shell 100 negatively charged and electrically connected to the second pole 600.

[0048] Specifically, in the embodiment, the third side wall 113 of the shell 100 is provided with a limiting part 120, the limiting part 120 is connected to the third side wall 113 by welding, gluing or riveting or the like, or the limiting part is an integral structure with the third side wall 113. The limiting part 120 is connected to the insulating part 300 by insertion, clamping, riveting or screw connection or the like, thereby preventing the insulating part 300 from rotating relative to the third side wall 113 and contacting the first side wall 111 and the second side wall 112. It can be understood that, in order to make the battery have a higher energy density, the insulating part 300 is a long and thin structure, and therefore when it contacts the first side wall 111 and the second side wall 112, the contact area is small, especially when the insulating part 300 is a square structure, it is in line contact with the first side wall 111 and the second side wall 112. Therefore, when an external force is applied, the first side wall 111 and the second side wall 112 will be subjected to concentrated force, and the first side wall 111 and the second side wall 112 will be easily punctured. On the other hand, in some embodiments, the shell 100 includes a bottom shell 101 and a cover plate 102, the bottom shell 101 includes the first side wall 111 and the third side wall 113, and the cover plate 102 includes the second side wall 112. The cover plate 102 is welded to the bottom shell 101, and when the insulating part 300 contacts the first side wall 111 and the second side wall 112, an acting force will be generated between the bottom shell 101 and the cover plate 102 when the battery is subjected to an external force, and a crack will easily occur at the welding position of the bottom shell 101 and the cover plate 102.

[0049] The embodiment can effectively improve this problem. The limiting part 120 in the embodiment is connected to the insulating part 300 to limit the insulating part 300, prevent the insulating part 300 from rotating relative to the third side wall 113, thereby avoiding the insulating part 300 from contacting the first side wall 111 and the second side wall 112, thereby reducing the risk of the first side wall 111 and the second side wall 112 being punctured, and reducing the risk of a crack occurring in the welding structure between the cover plate 102 and the bottom shell 101, thereby improving the performance of the battery.

[0050] It should be noted that the embodiment is not limited to the insulating part 300 being arranged at the first pole 200. For example, in some battery cases without electricity, the positive and negative poles need to be insulated from the shell 100, and therefore the insulating part 300 needs to be arranged at the positive and negative poles. Similarly, two limiting parts 120 need to be arranged to be connected to the two insulating parts 300 to limit the insulating part 300 from rotating relative to the third side wall 113.

[0051] Referring to Figures 4 to 7 , Figure 5 is a structure diagram of a second battery according to a first aspect of the present application, Figure 6 is Figure 5 a sectional view, Figure 7 is Figure 6Enlarged view of the middle B region. In some embodiments, the connecting relationship between the limiting portion 120 and the insulating piece 300 is plug-in, so that the connection between the limiting portion 120 and the limiting piece is more convenient, thereby improving the assembly efficiency of the battery. For example, in some embodiments, the limiting portion 120 protrudes from the first surface 1131, the insulating piece 300 has a first plug-in hole 321 (as shown in Figure 4 illustrated), and the limiting portion 120 is plugged into the first plug-in hole 321. Specifically, it can be understood that the wall thickness of the battery shell 100 is usually thin, and thus, directly machining the plug-in hole on the shell 100 of the battery can cause the shell 100 to be thinner at the plug-in hole, which can easily cause the shell 100 to break. Based on this, in the present embodiment, the limiting portion 120 is provided as a protruding portion on the first surface 1131, the insulating piece 300 has the first plug-in hole 321, and the limiting portion 120 is plugged into the first plug-in hole 321, thereby ensuring the strength of the shell 100 and reducing the risk of the shell 100 breaking while making the battery assembly convenient.

[0052] In some embodiments, the third side wall 113 includes the limiting portion 120, and the surface of the third side wall 113 opposite to the first surface 1131 (for the convenience of description, the surface of the third side wall 113 opposite to the first surface 1131 will be referred to as the second surface 1132 unless otherwise specified) is further provided with a boss 130 (as shown in Figure 5 illustrated), and the size of the boss 130 protruding from the second surface 1132 is not greater than the size of the first pole 200 protruding from the second surface 1132. The limiting portion 120 has a second plug-in hole 121, and the second plug-in hole 121 extends to the boss 130 (as shown in Figure 7 illustrated), that is, in the present embodiment, the boss 130 is provided at the second plug-in hole 121, which can avoid the wall thickness of the second plug-in hole 121 being too thin to ensure the strength of the shell 100, and at the same time, the inside of the accommodating cavity 114 does not need to be provided with a protruding portion, which avoids the limiting portion 120 occupying the space in the accommodating cavity 114, and the size of the boss 130 protruding from the second surface 1132 is not greater than the size of the first pole 200 protruding from the second surface 1132, thereby improving the energy density of the battery.

[0053] Referring to Figure 4In some embodiments, the insulating member 300 includes an insulating portion 310 and a connecting portion 320. The busbar 400 is connected to the side of the insulating portion 310 facing away from the first surface 1131. The connecting portion 320 is connected to the insulating portion 310 and protrudes from the surface of the insulating portion 310 facing away from the first surface 1131. The connecting portion 320 has a first insertion hole 321. Specifically, the connecting portion 320 protrudes from the surface of the insulating portion 310, that is, the thickness of the connecting portion 320 is greater than the thickness of the insulating portion 310. The first insertion hole 321 is provided in the connecting portion 320, thereby ensuring the depth of the first insertion hole 321 and ensuring the connection strength between the insulating member 300 and the limiting portion 120, thereby further reducing the risk of rotation of the insulating member 300. Therefore, it can be seen that in this embodiment, the insulation member 300 only needs to increase the thickness at the location where the first insertion hole 321 is provided, without the entire thickness of the insulation member 300 needing to be equal to the thickness of the connecting portion 320. This not only reduces the mass of the insulation member 300 but also its volume. Thus, this embodiment ensures a high energy density for the battery while maintaining the connection strength between the insulation member 300 and the limiting member.

[0054] Reference Figures 8 to 10 , Figure 8 This is a schematic diagram of the structure of the third type of battery according to the first aspect of this utility model. Figure 9 for Figure 8 sectional view, Figure 10 for Figure 9 In an enlarged view of region C, in some embodiments, the surface of the third sidewall 113 opposite to the first surface 1131 (the second surface 1132 in the figure) also has a receiving groove 140 (e.g. Figure 8 As shown), the receiving groove 140 extends to the limiting part 120 (as shown). Figure 10 (As shown). Therefore, when the battery of this embodiment is applied to an electrical device, some components of the electrical device can be placed into the receiving slot 140, making full use of the internal space of the electrical device and making the structure of the electrical device more compact. In addition, when the battery of this embodiment is assembled with a PCB board to form a battery assembly for powering an electrical device, components such as chips, capacitors or resistors on the PCB board can extend into the receiving slot 140, thereby reducing the external space occupied by the PCB board, reducing the volume of the battery assembly, and increasing the energy density of the battery assembly.

[0055] Based on the above embodiment, the limiting part 120 and the receiving groove 140 are formed by stamping towards the first surface 1131 via the third sidewall 113. Specifically, stamping can quickly complete the limiting part 120 and the receiving groove 140, thereby improving the processing efficiency of the battery in this embodiment. Moreover, the stamped part is lightweight and has good rigidity, which can make the battery stronger while ensuring the strength of the outer casing 100, thereby improving the energy density of the battery in this embodiment.

[0056] On the basis of the above-mentioned embodiments, the wall thickness of the third side wall 113 is t, and the dimension of the limiting portion 120 is h. When the third side wall 113 is a side wall in the length direction of the battery, the thickness direction of the third side wall 113 is the length direction of the battery, and t≤h≤5t. Specifically, it can be understood that the larger the dimension of the limiting portion 120, the greater the degree of concave during stamping. When the degree of concave is too large, the shell 100 has a risk of rupture. When the dimension of the limiting portion 120 is too small, the connection strength between the limiting portion 120 and the insulating member 300 is reduced. Therefore, in the present embodiment, the dimension of the limiting portion 120 is set within a suitable range, so as to reduce the risk of rupture of the shell 100 under the premise of ensuring a high connection strength between the limiting portion 120 and the insulating member 300, thereby improving the performance of the battery of the present embodiment.

[0057] With reference to Figure 2 and Figure 11 , Figure 11 for Figure 2 the structure of the insulating member and the bus bar in the battery. In some embodiments, the insulating member 300 has a clamping groove 340, and the bus bar 400 is arranged in the clamping groove 340. Specifically, it can be understood that when impacted, the shell 100 of the battery may deform. When the deformation is too large, the shell 100 may come into contact with the bus bar 400 and cause short circuit of the battery. The present embodiment can effectively improve this problem. In the present embodiment, the bus bar 400 is located inside the clamping groove 340, so that even if the shell 100 deforms, the shell 100 can be effectively prevented from coming into contact with the bus bar 400, thereby reducing the risk of short circuit of the battery and improving the safety of the battery of the present embodiment. In addition, the bus bar 400 is located in the clamping groove 340, and the side wall of the clamping groove 340 can prevent the bus bar 400 from rotating and contacting the first side wall 111 and the second side wall 112, thereby preventing the bus bar 400 from contacting the first side wall 111 and the second side wall 112, and further preventing the shell 100 from being damaged due to extrusion of the bus bar 400, thereby further improving the performance of the battery of the present embodiment.

[0058] According to the battery assembly of the second aspect of the utility model, the PCB board is arranged on the surface (second surface 1132 in the drawing) of the third side wall 113 opposite to the first surface 1131. In the embodiment, the third side wall 113 of the shell 100 is provided with the limiting part 120, the limiting part 120 is connected to the insulating part 300, and the limiting part 120 is used for limiting the rotation of the insulating part 300. Therefore, when the battery is interfered by the outside, the risk of the rotation of the insulating part 300 relative to the third side wall 113 can be effectively reduced, so that the risk of the extrusion of the insulating part 300 to the first side wall 111 and the second side wall 112 is reduced, and the risk of the damage of the battery shell 100 is reduced, and the performance of the battery assembly of the embodiment is improved.

[0059] It should be noted that, since the embodiment adopts all the technical features of the battery of the first aspect of the embodiment, the embodiment has all the beneficial effects brought by the first aspect of the embodiment, and details are not repeated here.

[0060] In some embodiments, the surface of the third side wall 113 opposite to the first surface 1131 also has the accommodating groove 140, the accommodating groove 140 extends to the limiting part 120, the PCB board includes the substrate and a plurality of components connected to the substrate, and at least part of the components are accommodated in the accommodating groove 140, so that the external space occupied by the PCB board is reduced, the volume of the battery assembly is reduced, the influence of the limiting part 120 on the energy density of the battery is reduced, and the battery assembly has a higher energy density under the premise of reducing the risk of the damage of the battery shell 100.

[0061] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of the ordinary skill in the art without departing from the purpose of the utility model. In addition, in the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above-mentioned terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way.

Claims

1. A battery, characterized by, The battery comprises: a shell comprising a shell part and a limiting part, the shell part comprising a first sidewall and a second sidewall arranged along a thickness direction of the battery, and a third sidewall between the first sidewall and the second sidewall, the shell part having a receiving cavity, a surface of the third sidewall facing the receiving cavity being a first surface, and the limiting part being connected to the first surface; a first pole post passing through the third sidewall; an insulating member connected to the first surface, and the limiting part being connected to the insulating member to limit rotation of the insulating member; a busbar connected to a side of the insulating member away from the first surface and electrically connected to the first pole post.

2. The battery of claim 1, wherein, The limiting part and the insulating member are connected in a plug-in manner.

3. The battery of claim 2, wherein, The limiting part protrudes from the first surface, and the insulating member has a first plug-in hole, and the limiting part is plugged into the first plug-in hole.

4. The battery of claim 3, wherein, The insulating member comprises an insulating part and a connecting part, the busbar being connected to a side of the insulating part away from the first surface, the connecting part being connected to the insulating part and protruding from a surface of the insulating part away from the first surface, and the connecting part having the first plug-in hole.

5. The battery of claim 2, wherein, The surface of the third sidewall opposite to the first surface further has a receiving groove, and the receiving groove extends to the limiting part.

6. The battery of claim 5, wherein, The limiting part and the receiving groove are formed by punching the third sidewall toward the first surface.

7. The battery of claim 6, wherein, The third sidewall has a wall thickness t, and along the thickness direction of the third sidewall, the limiting part has a size h, and t≤h≤5t.

8. The battery of claim 1, wherein, The insulating member has a clamping groove, the busbar is arranged in the clamping groove, and the busbar abuts against a sidewall of the clamping groove.

9. A battery assembly characterized by, The battery comprises: The battery of any one of claims 1 to 8; a PCB board arranged on a surface of the third sidewall opposite to the first surface.

10. The battery assembly of claim 9, wherein, The surface of the third sidewall opposite to the first surface further has a receiving groove, and the receiving groove extends to the limiting part; The PCB board comprises a substrate and a plurality of components connected to the substrate, and at least part of the components are accommodated in the receiving groove.

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