Batteries and electrical equipment

Abstract

This utility model relates to a battery and an electrical device. The battery includes a casing, a cell assembly, and a terminal assembly. The casing has an internal cavity and an opening at the top. The opening includes a first edge and a second edge opposite to each other, with a distance A between the first edge and the second edge. The cell assembly includes multiple cell bodies and a tab assembly. One end of the tab assembly is connected to the multiple cell bodies. The terminal assembly is connected to the other end of the tab assembly and can cover the opening, fitting against the first edge and the second edge. The tab assembly forms at least one bend between the terminal assembly and the cell body. The first bend has a first protrusion facing the first edge. The terminal assembly is welded to the casing. The horizontal distance from the first protrusion to the welding point is B, and the ratio of B to A is 0.4-2.4. This battery reduces the problem of weld failure when the terminal is welded to the opening by controlling the bending point of the tab.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery and an electrical device. Background Technology

[0002] A battery typically includes a casing, a cell housed within the casing, and terminals connected to the cell. In related technologies, to simplify battery assembly, an opening for terminal connection is usually provided on one side of the casing. The cell leads out from one end of a tab and is directly connected to the terminal. The terminal is then covered by the opening and welded to it to achieve battery assembly. However, during the welding process between the terminal and the opening, the tab connecting the terminal and the cell will first fold and then bend inside the casing. If the bending point of the tab is not controlled, bridging between the tab and the terminal can easily occur during welding, potentially leading to short circuits due to overlap, which is not in line with battery manufacturing processes. Utility Model Content

[0003] Based on the above-mentioned technical problems, this utility model provides a battery and electrical device that reduces the problem of weld failure between the electrode post and the opening when the bending point of the electrode tab is controlled, thereby at least partially solving the above-mentioned technical problems.

[0004] In a first aspect, this disclosure provides a battery, comprising: a casing having an internal cavity, the top of the casing having an opening, the opening having opposing first and second edges, the distance between the first and second edges being A; a cell assembly having multiple cell bodies and tab assemblies, one end of the tab assembly being connected to the multiple cell bodies; and a terminal assembly connected to the other end of the tab assembly, the terminal assembly being able to conform to the first and second edges when covering the opening, the tab assembly forming at least one bend between the terminal assembly and the cell body, the first bend having a first protrusion in a direction along the terminal assembly to the cell assembly, the first protrusion being disposed toward the first edge, the terminal assembly being welded to the casing in a direction along the second edge toward the first edge, the horizontal distance from the first protrusion to the welding point being B, the ratio of B to A being 0.4-2.4.

[0005] By controlling the horizontal distance B between the first protrusion and the welding point, the battery can be assembled by first inserting multiple battery cells into the housing cavity, then pre-connecting the two ends of the tab assembly to the battery cell and the terminal assembly, and then covering the opening with the terminal assembly. The bending shape of the tab assembly can be finely adjusted in advance to ensure that the distance B is within the range of the minimum and maximum values ​​of the ratio of B to A. The terminal assembly can then be assembled with the opening by attaching and welding the terminal assembly to the first edge and the second edge, thus completing the battery assembly. After the battery is assembled, the horizontal distance B between the first protrusion and the welding point inside the housing can be determined by computed tomography (CT) scan, i.e., whether the ratio of B to A is within the aforementioned range. This reduces the problem of weld bridging between the tab assembly and the terminal assembly during welding, thereby reducing or avoiding the problem of short circuits caused by the tab assembly and the terminal assembly bridging. Attached Figure Description

[0006] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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.

[0007] Figure 1 This is a schematic diagram of the battery structure provided in an exemplary embodiment of the present utility model;

[0008] Figure 2 for Figure 1 A magnified view of the area at position G in the middle;

[0009] Figure 3 for Figure 1 A magnified view of the G' position in the middle.

[0010] Explanation of reference numerals in the attached figures:

[0011] 1. Shell; 101. Receiving cavity; 110. Opening; 111. First edge; 112. Second edge; 120. Welding point;

[0012] 2. Battery cell assembly; 210. Battery cell body; 220. Electrode assembly; 2201. First section; 2202. Second section; 2203. Third section; 221. Electrode; 230. Bending portion; 231. First bending portion; 232. Second bending portion; 2311. First protrusion; 2312. First recess; 2321. Second recess; 240. Adapter;

[0013] 3. Pole assembly; 310. Pole body; 320. Connector; 321. First connecting part; 322. Second connecting part; 330. Press-fit part; 331. Second welding point. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments 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.

[0015] A battery typically includes a casing, a cell housed within the casing, and terminals connected to the cell. In related technologies, to simplify battery assembly, an opening for terminal connection is usually provided on one side of the casing. The cell leads out through a tab at one end and is directly connected to the terminal. The terminal is then covered by the opening and welded to it to achieve battery assembly. However, during the welding process between the terminal and the opening, the tab connecting the terminal and the cell will first fold and then bend inside the casing. If the bending point of the tab is not controlled, bridging between the tab and the terminal can easily occur during welding, potentially leading to short circuits due to overlap, which is not in line with battery manufacturing processes.

[0016] In view of the above-mentioned technical problems, the first aspect of this disclosure provides a battery, with reference to... Figures 1 to 3 As shown, the battery includes a casing 1, a cell assembly 2, and a terminal assembly 3. The casing 1 has an internal cavity 101, and an opening 110 at its top. The opening 110 includes a first edge 111 and a second edge 112 opposite to each other, with a distance A between the first edge 111 and the second edge 112. The cell assembly 2 includes multiple cell bodies 210 and a tab assembly 220, with one end of the tab assembly 220 connected to the multiple cell bodies 210. The terminal assembly 3 is connected to the other end of the tab assembly 220, and the terminal assembly 3 can cover the opening 110. When the electrode assembly 220 is attached to the first edge 111 and the second edge 112, at least one bend 230 is formed between the electrode assembly 3 and the cell body 210. In the direction along the electrode assembly 3 to the cell assembly 2, the first bend 230 has a first protrusion 2311, which is disposed toward the first edge 111. In the direction along the second edge 112 toward the first edge 111, the electrode assembly 3 is welded to the housing 1. The horizontal distance from the first protrusion 2311 to the welding point 120 is B, and the ratio of B to A is 0.4-2.4.

[0017] Through the above technical solution, namely the battery provided in this disclosure, by controlling the horizontal distance B between the first protrusion 2311 and the welding point, during battery assembly, multiple cell bodies 210 can be first installed into the receiving cavity 101 of the housing 1, and then the two ends of the electrode assembly 220 can be pre-connected to the cell body 210 and the terminal assembly 3 respectively. Before covering the opening 110 with the terminal assembly 2, the bending shape of the electrode assembly 220 can be finely adjusted in advance to ensure that the distance B is within the range of the minimum and maximum values ​​of the ratio of B to A, thus allowing the terminal assembly to be installed. The assembly of component 3 and opening 110 is completed by attaching and welding the terminal assembly 3 to the first edge 111 and the second edge 112 respectively. After the battery is assembled, the horizontal distance B between the first protrusion 2311 and the welding point inside the housing 1 can be determined by computer tomography, that is, whether the ratio of B to A is within the range defined above. This can reduce the problem of bridging between the terminal assembly 220 and the terminal assembly 3 during welding, thereby reducing or avoiding the problem of short circuit between the terminal assembly 220 and the terminal assembly 3.

[0018] It should be noted that in the above embodiments, the battery can be either a square battery or a cylindrical battery. When a square battery is used, multiple cell bodies 210 can be arranged side by side along the length direction of the casing 1 of the square battery. When a cylindrical battery is used, the cell body 210 can extend radially along the casing 1 into a cylindrical cell.

[0019] Furthermore, if the ratio of distance B to distance A exceeds 2.4, i.e., exceeds the maximum value, the first protrusion 2311 and the first edge 111 may become too close. In this case, if the pole assembly 3 is directly placed over the opening 110 and attached to the first edge 111 and the second edge 112, welding assembly may result in the first protrusion 2311 and the first edge 111 being welded together. At this time, one end of the tab assembly 220 is connected to the pole assembly 3, and the first protrusion 2311 will also be connected to the pole assembly 3 during the welding process, resulting in multiple conductive points and making short circuits very likely. Furthermore, if the ratio of distance B to distance A is less than 0.4, i.e. less than the minimum value, it is easy to cause the overall length of the tab assembly 220 to be too short, which will make it difficult to assemble the tab assembly 220 with the pole assembly 3 and the cell body 210. In addition, it is easy to damage the tab assembly 220 during welding, which will affect the performance of the tab assembly 220. Therefore, considering that the ratio of B to A is in the range of 0.4 and 2.4, it can ensure that the first protrusion 2311 will not be welded to the first edge 111, and also ensure that the length of the tab assembly 220 itself is convenient for assembly and installation.

[0020] Furthermore, the ratio of B to A can be selected according to the actual shape or size of the battery, as long as the ratio of B to A is between 0.4 and 2.4. For example, the ratio of B to A can be 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.3, or 2.4. This embodiment does not impose any further limitations on this.

[0021] For smaller square or cylindrical batteries, such as the battery provided by this invention, A can be further limited to the range of 8.6mm-15mm, and B can be further limited to the range of 7mm-20mm. Within this range, the ratio of B to A is still within the range of 0.4-2.4. Furthermore, limiting the specific distance between A and B can better adapt to the internal space of the battery casing 1.

[0022] Furthermore, the range of A can be selected according to the actual situation, as long as it is between 8.6mm and 15mm. For example, A can be selected as 8.6mm, 9mm, 10mm, 12mm, 14mm, or 15mm. This embodiment does not impose any restrictions on this.

[0023] The range of B can also be selected according to the actual situation, as long as it is between 7mm and 20mm. For example, B can be selected as 7mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, or 20mm. This embodiment does not impose any further restrictions on this.

[0024] Furthermore, by limiting the range of B, the possibility of the tab assembly 220 being damaged due to high-temperature welding during the welding process can be reduced or prevented from being too close to the first protrusion 2311.

[0025] To facilitate a further understanding of the background technology and the present solution by those skilled in the art, the battery function mentioned above typically has the ability to store chemical energy and controllably convert chemical energy into electrical energy. In recyclable batteries, the active materials can be activated by charging after discharge and can continue to be used. It typically includes a casing and a battery cell disposed within the casing.

[0026] The aforementioned battery cell is the component in a battery where electrochemical reactions occur. It is the smallest unit in a battery capable of performing electrochemical reactions such as charging and discharging, and typically includes a positive electrode, a negative electrode, and a separator. Lithium-ion battery cells primarily function by the insertion and extraction of lithium ions between the positive and negative electrodes. In cylindrical cells, a three-layer thin-film structure is wound into a cylindrical electrode assembly, while in cuboid cells, the thin-film structure is wound or stacked into an electrode assembly with a roughly cuboid shape.

[0027] The aforementioned housing is a component used to provide a space to house electrode assemblies and other parts, isolating them from the external environment. The housing generally includes a body with an opening at at least one end and a receiving cavity. The opening can be closed by a cover plate, sealing and isolating the internal environment of the battery cell from the external environment. Housing materials include, but are not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, and aluminum-plastic film.

[0028] The aforementioned tab assembly is typically located on one side of the positive / negative current collector and is either separate from or integrally formed with the current collector. It is electrically connected to the current collector to conduct current through it. It is made of a highly conductive metallic material (such as copper, aluminum, or nickel).

[0029] Furthermore, in the above embodiments, by limiting the ratio of B to A to the range of 0.4 to 2.4, any suitable value can be selected, such as any suitable value among 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, and 2.4. This embodiment does not make any specific limitation in this regard.

[0030] In some implementations, reference Figures 1 to 3 As shown, along the direction from the electrode assembly 3 to the cell assembly 2, the minimum distance between the first edge 111 and the cell assembly 2 is C, where C satisfies 2mm-4.5mm, and the distance between the first protrusion 2311 and the cell assembly 2 is D, where D satisfies 0.2mm-1.2mm.

[0031] By limiting the distance D between the first protrusion 2311 and the cell assembly 2 in the height direction of the cell body 210, the short circuit caused by the first protrusion 2311 contacting the inner top wall of the housing 1 or the terminal assembly 3 can be reduced or prevented. Furthermore, the short circuit caused by the first protrusion 2311 being inserted backwards into the cell body 210 can also be reduced or prevented. (Refer to...) Figure 2 and Figure 3 As shown, when D exceeds the maximum value, the first protrusion 2311 is likely to overlap the inner top wall of the housing 1 or the terminal assembly 3, thus causing a short circuit. When D is less than the minimum value, the first protrusion 2311 is likely to be inserted upside down into the cell body 210, which can also easily cause a short circuit. Therefore, considering all factors, a layout where D is within the range of 0.2mm-1.2mm is more reasonable.

[0032] Furthermore, the values ​​of C and D can be chosen according to the actual situation, as long as C is between 2mm and 4.5mm and D is between 0.2mm and 1.2mm. For example, C can be 2mm, 3mm, 4mm, 4.2mm, or 4.5mm, and D can be 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, or 1.2mm.

[0033] In some implementations, reference Figures 1 to 3 As shown, along the direction from the terminal assembly 3 to the cell assembly 2, the bending portion 230 includes a first bending portion 231 and a second bending portion 232. A first protrusion 2311 is formed on the first bending portion 231. The first bending portion 231 is provided with a first recess 2312 facing opposite to the first protrusion 2311. The second bending portion 232 is provided with a second recess 2321. The first recess 2312 and the second recess 2321 face opposite directions.

[0034] By bending the tab assembly 220 into three segments via the first bending portion 231 and the second bending portion 232, the tab assembly 220 can be positioned more flexibly within the receiving cavity 101 when connected to the terminal assembly 3 and the cell body 210. Furthermore, referring to… Figure 2 As shown, the tab assembly 220 is bent into an S-shape by the first bending portion 231 and the second bending portion 232, which can also reduce or prevent the tab assembly 220 from being inserted upside down into the cell body 210 to prevent short circuits.

[0035] In some implementations, reference Figures 1 to 3 As shown, multiple battery cell bodies 210 are connected to tabs 221, and the multiple tabs 221 are brought together to form a tab assembly 220.

[0036] In the above manner, multiple tabs 221 can be connected to multiple cell bodies 210 one by one, and after being gathered together, they are connected to the terminal assembly 3, so as to realize the transmission of electrical energy from the cell body 210 to the terminal assembly 3, so as to realize the normal power supply of the battery.

[0037] It should be noted that the convergence position of the multiple tabs 221 can be any suitable position. Specifically, a reasonable position can be selected based on the actual space of the receiving cavity 101 inside the battery casing 1. For example, the convergence position of the multiple tabs 221 can be selected as the position of the multiple cell bodies 210 located at the edge, or it can be converged towards the center of the multiple cell bodies 210.

[0038] Specifically, you can refer to Figure 2 and Figure 3As shown, multiple tabs 221 converge toward the center of multiple battery cell bodies 210, and after the multiple tabs 221 converge, they are bent to form a first bent portion 231.

[0039] In this way, multiple tabs 221 converge toward the center of the cell body 210, which can minimize the bending of some tabs 221 connected to the edge of the cell body 210, thereby reducing the possibility of tabs 221 breaking due to bending and further improving the service life of the tabs.

[0040] Furthermore, in the above embodiment, when the number of bending portions 230 is a single one, the range of D can be further limited to 0.22mm-0.84mm. In this case, the range of D can represent the distance of the tab 221 under pressure after bending.

[0041] The specific value of D can be chosen according to the actual situation, as long as it is between 0.22mm and 0.84mm. For example, D can be selected as 0.22mm, 0.25mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.82mm, or 0.84mm.

[0042] When the bending portion 230 includes the first bending portion 231 and the second bending portion 232, that is, two bending segments, the range of D can be further limited to 0.3mm-1.2mm. At this time, the range of D can represent the distance of the tab 221 after bending with some redundant space.

[0043] The specific value of D can be chosen according to the actual situation, as long as it is between 0.3mm and 1.2mm. For example, D can be 0.3mm, 0.4mm, 0.5mm, 0.7mm, 0.9mm, 1.0mm, or 1.2mm.

[0044] In some implementations, reference Figures 1 to 3 As shown, the portion of the tab assembly 220 located between the pole post assembly 3 and the first bend 231 is the first segment 2201; the portion of the tab assembly 220 located between the first bend 231 and the second bend 232 is the second segment 2202; and the portion of the tab assembly 220 located between the second bend 232 and the cell body 210 is the third segment 2203.

[0045] In the above manner, the tab assembly 220 is divided into a first segment 2201, a second segment 2202, and a third segment 2203. When the terminal assembly 3 is connected to the cell body 210, the tab assembly 220 can form an S-shaped structure through the three segments, which facilitates the connection between the cell body 210 and the terminal assembly 3 via the tab assembly 220, and also provides good overcurrent performance. Figure 2 and Figure 3 As shown, the first segment 2201 and the second segment 2202 can be straight segments connected to both ends of the first bend 231, respectively. In this arrangement, the straight first segment 2201 and the straight second segment 2202 can further improve the overall current flow performance of the tab assembly 220.

[0046] The third segment 2203 can be connected to multiple battery cell bodies 210, and after forming a converged segment, it is connected to the second bending part 232, thereby enabling the electrical energy released by multiple battery cell bodies 210 to be combined.

[0047] In some implementations, reference Figure 2 and Figure 3 As shown, the length E of the first segment 2201 is less than half the distance between the first edge 111 and the second edge 112; and / or, the length F of the second segment 2202 is less than half the distance A between the first edge 111 and the second edge 112.

[0048] By controlling the length of the first segment 2201 and / or the second segment 2202 in the above manner, it is possible to reduce or prevent the first segment 2201 and / or the second segment 2202 from being too long, which could lead to the reverse insertion of the battery cell body 210 or the short circuit caused by overlapping with the inner wall of the housing 1. Figure 2 and Figure 3 As shown, when the length E of the first segment 2201 exceeds half of A, the first segment 2201 is prone to falling due to its excessive length and gravity, and may sag and overlap the inner wall of the cell body 210 or the housing 1, which may easily cause a short circuit. Similarly, when the length F of the second segment 2202 exceeds half of A, the second segment 2202 is also prone to falling due to its excessive length, and may overlap the inner wall of the cell body 210 or the housing 1, which may also easily cause a short circuit. Therefore, in order to ensure the overall coordination of the tab assembly 220 and reduce or prevent short circuits, limiting the lengths of E and F to less than half of A is a relatively reasonable arrangement.

[0049] It should be noted that since the position of the tab assembly 220 connected to the pole assembly 3 remains unchanged, if the length of either the first segment 2201 or the second segment 2202 exceeds half of A, or if the length of both exceeds half of A, a short circuit may occur. Therefore, to ensure that no short circuit occurs, the length of either the first segment 2201 or the second segment 2202 must not exceed half of A.

[0050] In some implementations, reference Figures 1 to 3 As shown, the battery cell assembly 2 also includes an adapter 240, through which the tab assembly 220 is connected to the terminal assembly 3.

[0051] In the above manner, the adapter 240 can stably transmit the current output from the cell body 210 to the terminal assembly 3. Specifically, the adapter 240 can adopt the following method: Figures 2 to 3 The sheet-like structure in the middle is used to achieve better flow performance.

[0052] Specifically, refer to Figure 2 and Figure 3 As shown, the electrode assembly 3 includes a connector 320 and an electrode body 310. The connector 320 includes a first connecting part 321 and a second connecting part 322. The first connecting part 321 is connected to the housing 1, and the second connecting part 322 is connected to the electrode body 310. The second connecting part 322 is higher than the first connecting part 321. The lower surface of the second connecting part 322 and the upper surface of the cell body 210 form a receiving space. The second bending part 232 is located within the receiving space.

[0053] In the above manner, one end of the tab assembly 220 can be fixed by connecting it to the connector 320. When the tab assembly 220 is connected to the connector 320, the adapter 240 connected to the tab assembly 220 can also be stably connected to the terminal body 310, thereby allowing the battery to maintain stable overcurrent performance.

[0054] In some implementations, reference Figure 2 and Figure 3 As shown, the distance between the second bent portion 232 and the side wall of the accommodating space is 2mm-15mm.

[0055] By limiting the distance between the second bend 232 and the side wall of the accommodating space in the above manner, the problem of weld bridging in the tab assembly 220 can also be prevented.

[0056] The specific distance between the second bending part 232 and the side wall of the accommodating space can be reasonably selected according to the actual situation. For example, it can be 2mm, 3mm, 5mm, 8mm, 10mm, 12mm, or 15mm.

[0057] In some implementations, reference Figure 2 and Figure 3 As shown, the pole assembly 3 also includes a press-fitting component 330, which is welded to the connector 320 to form a second welding point 331. The horizontal distance between the second bent portion 232 and the second welding point 331 is 1mm-10mm.

[0058] In the above manner, the press-fit component 330 can more stably connect and fix the pole assembly 3 to the housing 1. Furthermore, by limiting the horizontal distance between the second bend 232 and the second welding point to the range of 1mm-10mm when the press-fit component 330 is set, the problem of bridging welds in the tab assembly 220 can also be prevented.

[0059] Under the above-described implementation method, the actual size of the horizontal distance between the second bending portion 232 and the second welding point 331 can be any suitable value, as long as it is between 1mm and 10mm. For example, it can be 1mm, 2mm, 3mm, 5mm, 8mm, 8.5mm, or 10mm.

[0060] A second aspect of this disclosure is to provide an electrical device that includes the battery mentioned in the above-described specific embodiments and has all the beneficial effects of the above-described specific embodiments. The electrical device can be any device that can be applied to the battery, such as a mobile phone, tablet computer or power bank in a smart device; it can also be a lighting device such as a flashlight or work light; or it can be a cooking device such as an electric cooker, electric baking pan, rice cooker, etc. This disclosure does not impose any further limitations on it.

[0061] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope of protection claimed in this disclosure.

Claims

1. A battery, characterized by, include: The housing (1) has an internal cavity (101) and an opening (110) at the top. The opening (110) includes a first edge (111) and a second edge (112) opposite to each other. The distance between the first edge (111) and the second edge (112) is A. The battery cell assembly (2) includes a plurality of battery cell bodies (210) and a tab assembly (220), one end of the tab assembly (220) being connected to the plurality of battery cell bodies (210); A pole assembly (3) is connected to the other end of the tab assembly (220). The pole assembly (3) is able to fit against the first edge (111) and the second edge (112) when covering the opening (110). The tab assembly (220) forms at least one bend (230) between the pole assembly (3) and the cell body (210). In the direction along the pole assembly (3) to the cell assembly (2), the first bend (230) has a first protrusion (2311) which is disposed toward the first edge (111). In the direction along the second edge (112) toward the first edge (111), the pole assembly (3) is welded to the housing (1). The horizontal distance from the first protrusion (2311) to the welding point (120) is B, and the ratio of B to A is 0.4-2.

4.

2. The battery of claim 1, wherein, A meets the requirements of 8.6mm-15mm.

3. The battery of claim 2, wherein, B meets the requirement of 7mm-20mm.

4. The battery of claim 1, wherein, In the direction along the pole assembly (3) to the cell assembly (2), the minimum distance between the first edge (111) and the cell assembly (2) is C, where C satisfies 2mm-4.5mm, and the distance between the first protrusion (2311) and the cell assembly (2) is D, where D satisfies 0.2mm-1.2mm.

5. The battery of claim 4, wherein, Along the direction from the pole assembly (3) to the cell assembly (2), the bending portion (230) includes a first bending portion (231) and a second bending portion (232). A first protrusion (2311) is formed on the first bending portion (231). The first bending portion (231) has a first recess (2312) facing opposite to the first protrusion (2311). The second bending portion (232) has a second recess (2321). The first recess (2312) and the second recess (2321) face opposite to each other.

6. The battery according to claim 5, characterized in that, Each of the multiple battery cell bodies (210) is connected to a tab (221), and the multiple tabs (221) are brought together to form the tab assembly (220).

7. The battery of claim 6, wherein, Multiple tabs (221) converge toward the center of multiple battery cell bodies (210), and after the multiple tabs (221) converge, they are bent to form the first bent portion (231).

8. The battery of claim 7, wherein, The portion of the tab assembly (220) located between the pole post assembly (3) and the first bend (231) is the first segment (2201); The portion of the electrode assembly (220) located between the first bend (231) and the second bend (232) is the second segment (2202); The portion of the tab assembly (220) located between the second bend (232) and the cell body (210) is the third segment (2203).

9. The battery of claim 8, wherein, The length E of the first segment (2201) is less than half the distance A between the first edge (111) and the second edge (112); and / or, The length F of the second segment (2202) is less than half the distance A between the first edge (111) and the second edge (112).

10. The battery of claim 5, wherein, The battery cell assembly (2) also includes an adapter (240), through which the tab assembly (220) is connected to the terminal assembly (3).

11. The battery of claim 10, wherein, The electrode assembly (3) includes a connector (320) and an electrode body (310). The connector (320) includes a first connecting part (321) and a second connecting part (322). The first connecting part (321) is connected to the housing (1), and the second connecting part (322) is connected to the electrode body (310). The second connecting part (322) is higher than the first connecting part (321). The lower surface of the second connecting part (322) and the upper surface of the cell body (210) form a receiving space. The second bending part (232) is located in the receiving space.

12. The battery of claim 11, wherein, The distance between the second bent portion (232) and the side wall of the accommodating space is 2mm-15mm.

13. The battery of claim 12, wherein, The pole assembly (3) further includes a press-fitting component (330), which is welded to the connector (320) to form a second welding point (331), and the horizontal distance between the second bent portion (232) and the second welding point (331) is 1mm-10mm.

14. An electrical device, characterized by Includes the battery as described in any one of claims 1-13.

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