Battery and power consuming device

Abstract

The utility model relates to a kind of battery and electric equipment, battery includes shell, pole post subassembly and electric core subassembly, shell inside is equipped with accommodating cavity, pole post subassembly is set on shell, electric core subassembly includes electric core body and tab subassembly, tab subassembly is connected to electric core body and pole post subassembly respectively;In the direction of electric core subassembly towards pole post subassembly, tab subassembly at least sequentially forms first bending part and second bending part, first bending part is equipped with first recess, second bending part is equipped with first protrusion;In horizontal direction, the distance between first recess and the inside wall of shell is L1, the distance between first recess and first protrusion is L2, the ratio of L2 and L1 is greater than or equal to 0.2, and less than or equal to 0.8, the battery can reduce or prevent tab tear or inverted plug situation occurs.

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 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, after the terminal covers the opening, the tab connecting the terminal and the cell will bend inside the casing. Since the tab is usually composed of multiple strips bonded together, if the length of the tab and the position of the bending point are not controlled, the tab is prone to tearing or being inserted upside down into the cell or casing, which can lead to poor current carrying capacity or short circuits. Utility Model Content

[0003] In view of the above-mentioned technical problems, the present invention provides a battery and electrical device that can reduce or prevent the occurrence of electrode tab tearing or reverse insertion, so as to at least partially solve the above-mentioned technical problems.

[0004] In a first aspect, this utility model provides a battery, comprising: a housing having an internal cavity; a terminal assembly disposed on the housing; and a cell assembly including a cell body and a tab assembly, the tab assembly being connected to the cell body and the terminal assembly respectively; in the direction of the cell assembly toward the terminal assembly, the tab assembly having at least a first bend and a second bend in sequence, the first bend having a first recess and the second bend having a first protrusion; in the horizontal direction, the distance between the first recess and the inner wall of the housing is L1, the distance between the first recess and the first protrusion is L2, and the ratio of L2 to L1 is greater than or equal to 0.2 and less than or equal to 0.8.

[0005] Secondly, this utility model provides an electrical device, including any of the batteries described above by Nanfang An.

[0006] In the above-described manner, i.e., the battery provided by this utility model, during the assembly process, the battery cell body of the cell assembly can first be installed into the receiving cavity inside the casing. A tab extends from one side of the cell assembly, passes through an opening on the casing, and is welded to the terminal assembly. Then, the terminal assembly cover is installed at the opening and welded to it. At this time, the tab assembly is folded together between the cell body and the terminal assembly, forming a first bend and a second bend. The distance L2 between the first recess and the first protrusion is equal to the distance L1 between the first recess and the inner wall of the casing. If the ratio is within the range of 0.2 and 0.8, the electrode assembly can be welded and packaged with the housing. Limiting the ratio of L2 to L1 to between 0.2 and 0.8 can reduce or prevent the distance between the first protrusion and the first recess in the electrode assembly from being too far, thereby reducing or preventing the electrode assembly from being inserted into the cell body in reverse or overlapping the inner wall of the housing, thus reducing the occurrence of short circuits. It can also reduce or prevent the distance between the first protrusion and the first recess in the electrode assembly from being too close, thereby reducing or preventing the multiple electrodes in the electrode assembly from tearing at the first protrusion or the first recess. Attached Figure Description

[0007] 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.

[0008] Figure 1 This is a schematic diagram of the battery structure provided in an exemplary embodiment of the present utility model;

[0009] Figure 2 for Figure 1 A magnified view of a portion of position A in the middle;

[0010] Figure 3 for Figure 1 A magnified view of the area at position A' in the middle;

[0011] Figure 4 This is a schematic diagram of another embodiment of the battery provided in an exemplary embodiment of the present utility model;

[0012] Figure 5 for Figure 4 A magnified view of a portion of position B in the middle;

[0013] Figure 6 This is a three-dimensional structural diagram of the battery provided in an exemplary embodiment of this utility model;

[0014] Figure 7 yes Figure 6 A magnified view of the area at position H.

[0015] Explanation of reference numerals in the attached figures:

[0016] 1. Shell; 101. Receiving cavity;

[0017] 2. Pole post assembly; 210. Pole post body;

[0018] 3. Battery cell assembly; 310. Battery cell body; 320. Electrode assembly; 3201. First section; 3202. Second section; 3203. Third section; 321. First bend; 3211. First recess; 322. Second bend; 3221. First protrusion; 323. Electrode;

[0019] 4. Guide bracket;

[0020] 5. Insulating components. Detailed Implementation

[0021] 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.

[0022] 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, after the terminal covers the opening, the tab connecting the terminal and the cell will bend inside the casing. Since the tab is usually composed of multiple strips bonded together, if the length of the tab and the position of the bending point are not controlled, the tab is prone to tearing or being inserted upside down into the cell or casing, which can lead to poor current carrying capacity or short circuits.

[0023] In view of the above-mentioned technical problems, the first aspect of this utility model provides a battery, as shown in the reference. Figures 1 to 7As shown, the battery includes a housing 1, a terminal assembly 2, and a cell assembly 3. The housing 1 has an internal receiving cavity 101. The terminal assembly 2 is disposed on the housing 1. The cell assembly 3 includes a cell body 301 and a tab assembly 302. The tab assembly 320 is connected to the cell body 310 and the terminal assembly 2, respectively. In the direction of the cell assembly 3 toward the terminal assembly 2, the tab assembly 320 forms at least a first bend 321 and a second bend in sequence. The first bend 321 has a first recess 3211, and the second bend 322 has a first protrusion 3221. In the horizontal direction, the distance between the first recess 3211 and the inner wall of the housing 1 is L1, and the distance between the first recess 3211 and the first protrusion 3221 is L2. The ratio of L2 to L1 is greater than or equal to 0.2 and less than or equal to 0.8.

[0024] In the above-described manner, i.e., the battery provided by this utility model, during the assembly process, the cell body 310 of the cell assembly 3 can be first installed into the receiving cavity 101 inside the housing 1. A tab extends from one side of the cell assembly 3, passes through the opening on the housing 1, and is welded to the terminal assembly 2. Then, the terminal assembly 2 is fitted onto the opening and welded to it. At this time, the tab assembly 320 is folded together between the cell body 310 and the terminal assembly 2, forming a first bend 321 and a second bend 322. The ratio of the distance L2 between the first recess 3211 and the first protrusion 3221 to the distance L1 between the first recess 3211 and the inner wall of the housing 1 satisfies the following condition: Within the range of 0.2 and 0.8, the electrode assembly 2 can be welded and encapsulated to the housing 1. By limiting the ratio of L2 to L1 to between 0.2 and 0.8, it can reduce or prevent the distance between the first protrusion 3221 and the first recess 3211 in the electrode assembly 320 from being too far apart, thereby reducing or preventing the electrode assembly 320 from being inserted into the battery cell body 310 or overlapped with the inner wall of the housing 1, so as to reduce the occurrence of short circuits. It can also reduce or prevent the distance between the first protrusion 3221 and the first recess 3211 in the electrode assembly 320 from being too close, so as to reduce or prevent the multiple electrodes in the electrode assembly 320 from tearing at the first protrusion 3221 or the first recess 3211.

[0025] It should be noted that, in the above embodiment, in order to confirm the bending condition of the tab assembly 320 after the terminal assembly 2 and the housing 1 are encapsulated and welded, the battery can be scanned by computed tomography (CT) scan. This can confirm the bending condition of the tab assembly 320 in the receiving cavity 101, that is, further confirm the bending degree and bending position of the first bending part 321 and the second bending part 322, and measure and confirm the distance between the first protrusion 3221 and the first recess 3211. If the measured distance L2 and L1 between the first protrusion 3221 and the first recess 3211 in the horizontal direction do not meet the above range, it is determined that the battery assembly does not meet the production requirements and needs to be scrapped or reassembled.

[0026] Furthermore, in the above embodiments, the battery can be either a prismatic battery or a cylindrical battery. When a prismatic battery is used, the distance between the first recess 3211 and the inner wall of the casing 1 can be understood as the distance from the opening of the first recess 3211 toward the inner wall corresponding to the prismatic battery. When a cylindrical battery is used, the distance between the first recess 3211 and the inner wall of the casing 1 can also be understood as the distance from the opening of the first recess 3211 toward the inner wall corresponding to the cylindrical battery.

[0027] In some implementations, reference Figures 1 to 3 As shown, the bending direction of the first bending portion 321 is towards the inner wall of one side of the housing 1, and the bending direction of the second bending portion 322 is towards the inner wall of the other side of the housing 1, so that the bending directions of the first bending portion 321 and the second bending portion 322 are opposite.

[0028] In the above manner, the tab assembly 320 can be bent into an S-shape by the first bending portion 321 and the second bending portion 322 facing opposite directions. This opposite bending method can further prevent the tab assembly 320 from being inserted into the battery cell body 310 in reverse.

[0029] In some implementations, reference Figure 2 and Figure 3 As shown, there are multiple battery cell bodies 310, and each of the multiple battery cell bodies 310 is connected to a tab 323. The multiple tabs 323 are brought together to form a tab assembly 320.

[0030] In the above manner, multiple tabs 323 can be connected to multiple cell bodies 310 one by one, and after being gathered together, they are connected to the terminal assembly 2, so as to realize the power transmission of the cell body 310 to the terminal assembly 2, so as to realize the normal power supply of the battery.

[0031] The number of the battery cell body 310 and the electrode tab 323 can be any suitable number, for example, refer to Figure 2 and Figure 3As shown in the embodiments of this utility model, an exemplary embodiment is shown in which the number of battery cell body 310 and electrode tab 323 is four each. In other embodiments, the number of battery cell body 310 and electrode tab 323 may be other numbers, such as two, three or more, as long as the number of battery cell body 310 and electrode tab 323 corresponds one-to-one, without being overly limited in this regard.

[0032] Furthermore, the convergence position of the multiple tabs 323 can be any suitable position. Specifically, the reasonable arrangement position can be selected according to the actual space of the receiving cavity 101 inside the battery casing 1. For example, the convergence position of the multiple tabs 323 can be selected as the position of the multiple cell bodies 310 located at the edge, or they can converge toward the center of the multiple cell bodies 310.

[0033] Specifically, you can refer to Figure 2 and Figure 3 As shown, multiple tabs 323 converge toward the center of multiple cell bodies 310, and after the multiple tabs 323 converge, they are bent to form a first bent portion 321.

[0034] In this way, multiple tabs 323 converge toward the center of the cell body 310, which can minimize the bending degree of some tabs 323 connected to the edge of the cell body 310, thereby reducing the possibility of the tabs 323 breaking due to bending and further improving the service life of the tabs 323.

[0035] In some implementations, reference Figures 1 to 3 As shown, the portion of the tab assembly 320 located between the cell body 310 and the first bending portion 321 is the first segment 3201; the portion of the tab assembly 320 located between the first bending portion 321 and the second bending portion 322 is the second segment 3202; and the portion of the tab assembly 320 located between the second bending portion 322 and the pole post assembly 2 is the third segment 3203.

[0036] In the above manner, the tab assembly 320 is divided into a first segment 3201, a second segment 3202, and a third segment 3203. When the terminal assembly 2 is connected to the cell body 310, the tab assembly 320 can form an S-shaped structure through the three segments, which facilitates the connection between the cell body 310 and the terminal assembly 2 via the tab assembly 320, and also provides good overcurrent performance. Figure 2 and Figure 3 As shown, the second segment 3202 and the third segment 3203 can be straight segments connected to both ends of the second bend 322, respectively. In this arrangement, the straight second segment 3202 and the straight third segment 3203 can further improve the overall current flow performance of the tab assembly 320.

[0037] The first segment 3201 can be connected to multiple battery cell bodies 310, and after forming a converged segment, it is connected to the first bending part 321, thereby enabling the electrical energy released by multiple battery cell bodies 310 to be combined.

[0038] In some implementations, reference Figure 2 and Figure 3 As shown, the thickness of the second segment 3202 is d, and the thickness d is between 0.5-2mm; and / or, the thickness of the third segment 3203 is d, and the thickness d is between 0.5-2mm.

[0039] By limiting the thickness of the second segment 3202 and / or the third segment 3203 as described above, the thickness of the second segment 3202 and / or the third segment 3203 is designed to provide sufficient and effective conductive area while also meeting the structural strength requirements of the tab assembly 320. Considering that both excessively large and small thicknesses d have their advantages and disadvantages, when the thickness d exceeds the maximum value, although the structural strength and conductive area of ​​the second segment 3202 and / or the third segment 3203 are improved, the excessive thickness can easily lead to increased weight, making the battery more susceptible to vibration and breakage during normal use. When the thickness d is less than the minimum value, although the second segment 3202 and / or the third segment 3203 can achieve weight reduction, the conductive area is easily reduced, which can lead to poor overcurrent performance and a decrease in structural performance. Therefore, considering all factors, a thickness d within the range of 0.5mm to 2mm is a relatively reasonable setting.

[0040] In some implementations, reference Figures 1 to 7 As shown, the upper surface of the housing 1 is provided with an opening 102, the pole body 210 passes through the opening 102, and the pole assembly 2 also includes a pole cover plate 220 connected to the opening 102, with the pole body 210 mounted on the pole cover plate 220.

[0041] In the above manner, through the opening 102 provided on the upper surface of the housing 1, when the pole body 210 is connected to the housing 1, the pole assembly 2 can be connected to the opening 102 through the pole cover plate 220, and the pole body 210 can then be connected to the pole cover plate 220 to achieve a tight assembly.

[0042] In another embodiment, reference can be made to Figures 1 to 7 As shown, the upper surface of the housing 1 can also be provided with an opening 102, and the pole cover plate 220 is also connected to the opening 102. However, unlike the above method, the bottom surface of the pole body 210 is higher than the inner top surface of the housing 1. In the horizontal direction, there is a gap between the first protrusion 3221 and the hole wall of the opening 102, and the size of the gap is 1~5mm.

[0043] In the above-mentioned way, that is, the pole body 210 is not completely inserted through the opening 102, but is partially inserted, the connection between the pole body 210 and the housing 1 can still be achieved. However, at this time, the horizontal distance between the first protrusion 3221 and the opening 102 needs to be considered. If the distance is greater than 5mm, that is, greater than the maximum value specified above, the pole tab assembly 320 is prone to tearing. If the distance is less than 1mm, that is, less than the minimum value specified above, the first protrusion 3221 is prone to collision, wear or foreign objects with the inner wall of the opening 102, which may easily cause a short circuit risk. Therefore, considering all factors, limiting the above distance to between 1 and 5mm is a relatively reasonable layout.

[0044] In some implementations, reference Figures 1 to 7 As shown, the battery may also include a guide bracket 4, and an insulating member 5 is provided between the cell body 310 and the side where the electrode body 210 on the housing 1 is located; one end of the guide bracket 4 is connected to the insulating member 5, and the other end has a gap with the electrode assembly 320. The guide bracket 4 is used to bend and guide the electrode assembly 320 to form a first bending part 321.

[0045] In the above manner, the insulating element can be used to insulate the battery cell body 310 from the housing 1, while one end of the guide bracket 4 is stably connected to the insulating element 5, and the other end can also serve to bend and guide the tab assembly 320.

[0046] In some implementations, reference Figure 4 and Figure 5 As shown, the ratio of the vertical distance between the guide bracket 4 and the cell body 310 to the vertical distance between the pole body 210 and the cell body 310 is between 0.2 and 0.5.

[0047] The above method limits the ratio of the vertical distance between the guide bracket 4 and the cell body 310 to the vertical distance between the pole body 210 and the cell body 310. If the ratio exceeds 0.5, i.e. exceeds the maximum value, the first bend 321 is prone to being inserted upside down into the cell body 310, resulting in a short circuit. If the ratio is less than 0.2, i.e. less than the minimum value, the guiding effect of the guide bracket 4 will also deteriorate, affecting the folding effect of the pole assembly 320. Therefore, considering all factors, limiting the ratio to the range of 0.2 to 0.5 is a relatively reasonable layout method.

[0048] In some implementations, reference Figure 4 and Figure 5 As shown, the horizontal distance between the guide bracket 4 and the first bending part 321 is between 0.5 and 4 mm.

[0049] By limiting the shortest horizontal distance between the guide bracket 4 and the first bend 321 as described above, it is possible to prevent the guide bracket 4 from being too close to the first bend 321, which could potentially cause the tab assembly 320 to tear.

[0050] In some implementations, reference Figures 1 to 7 As shown, the guide bracket 4 extends along the first direction to achieve good guidance in the width direction of the tab assembly 320, and the width direction of the tab assembly 320 can be understood as being in... Figure 7 In the middle, the direction perpendicular to the plane of the diagram and pointing inwards is the length direction of the battery.

[0051] Furthermore, the arrangement of the guide bracket 4 can be any suitable method, for example, refer to Figure 4 and Figure 5 As shown, the guide bracket 4 can be a single one, with the single guide bracket 4 disposed on one side of the first bend 321; or the guide bracket 4 can be two, with the two guide brackets 4 disposed on opposite sides of the first bend 321 respectively. It is only necessary to ensure that the guide bracket 4 can provide a good guiding effect for the tab assembly 320. This embodiment does not impose too many limitations on this.

[0052] 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.

[0053] 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 by the present invention.

Claims

1. A battery, characterized in that, include: The housing (1) has an internal cavity (101). The pole assembly (2) is disposed on the housing (1); The battery cell assembly (3) includes a battery cell body (310) and a tab assembly (320), wherein the tab assembly (320) is connected to the battery cell body (310) and the terminal assembly (2) respectively; In the direction of the cell assembly (3) toward the pole assembly (2), the tab assembly (320) forms at least a first bend (321) and a second bend (322) in sequence. The first bend (321) has a first recess (3211), and the second bend (322) has a first protrusion (3221). In the horizontal direction, the distance between the first recess (3211) and the inner wall of the shell (1) is L1, and the distance between the first recess (3211) and the first protrusion (3221) is L2. The ratio of L2 to L1 is greater than or equal to 0.2 and less than or equal to 0.

8.

2. The battery according to claim 1, characterized in that, The bending direction of the first bending portion (321) is toward the inner wall of one side of the housing (1), and the bending direction of the second bending portion (322) is toward the inner wall of the other side of the housing (1), so that the bending directions of the first bending portion (321) and the second bending portion (322) are opposite.

3. The battery according to claim 2, characterized in that, The portion of the electrode assembly (320) located between the battery cell body (310) and the first bent portion (321) is the first segment (3201); The portion of the electrode assembly (320) located between the first bend (321) and the second bend (322) is the second segment (3202); The portion of the tab assembly (320) located between the second bend (322) and the pole assembly (2) is the third segment (3203).

4. The battery according to claim 3, characterized in that, The thickness of the second segment (3202) is d, and the thickness d is between 0.5-2 mm; and / or; The thickness of the third segment (3203) is d, and the thickness d is between 0.5-2mm.

5. The battery according to claim 4, characterized in that, The pole assembly (2) includes a pole body (210), which is connected to the housing (1), and one end of the third segment (3203) is welded to the pole body (210).

6. The battery according to claim 5, characterized in that, The upper surface of the housing (1) is provided with an opening (102), and the pole body (210) passes through the opening (102).

7. The battery according to claim 5, characterized in that, The upper surface of the housing (1) is provided with an opening (102), and the pole assembly (2) further includes a pole cover plate (220) connected to the opening (102), and the pole body (210) is mounted on the pole cover plate (220); In the height direction of the battery, the bottom surface of the electrode body (210) is higher than the inner top surface of the housing (1). In the horizontal direction, there is a gap between the first protrusion (3221) and the wall of the opening (102), and the size of the gap is 1 to 5 mm.

8. The battery according to claim 7, characterized in that, The number of battery cell bodies (310) is multiple, and each of the multiple battery cell bodies (310) is connected to a tab (323). The multiple tabs (323) are brought together to form the tab assembly (320).

9. The battery according to claim 8, characterized in that, The multiple tabs (323) converge toward the center of the multiple battery cell bodies (310), and after the multiple tabs (323) converge, they are bent to form the first bent portion (321).

10. The battery according to claim 7, characterized in that, The battery also includes a guide bracket (4), and an insulating member (5) is provided between the cell body (310) and the side where the electrode body (210) is located on the housing (1); one end of the guide bracket (4) is connected to the insulating member (5), and the other end has a gap with the tab assembly (320). The guide bracket (4) is used to bend and guide the tab assembly (320) to form the first bending part (321).

11. The battery according to claim 10, characterized in that, The ratio of the vertical distance between the guide bracket (4) and the cell body (310) to the vertical distance between the pole body (210) and the cell body (310) is between 0.2 and 0.

5.

12. The battery according to claim 11, characterized in that, The horizontal distance between the guide bracket (4) and the first bent portion (321) is 0.5-4mm.

13. The battery according to any one of claims 10-12, characterized in that, The guide bracket (4) extends along the first direction.

14. The battery according to claim 13, characterized in that, The guide bracket (4) is a single unit, and the single guide bracket (4) is disposed on one side of the first bend (321); or, There are two guide brackets (4), which are respectively arranged on opposite sides of the first bend (321).

15. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1-14.

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