Electrochemical device and electric apparatus

Abstract

The utility model relates to electrochemical device, including electric core body, electric core body is steel shell electric core, the top surface and bottom surface including opposite setting on electric core body, the top surface is connected with the pole lug, the pole lug links to each other with circuit board, circuit board is parallel to top surface arrangement, the top surface forms the convex part, the convex part is equipped with the convex end surface parallel to top surface, the end surface of circuit board away from top surface is lower than the plane where convex end surface lies, the circuit board is covered with injection molding spare, the end surface of injection molding spare away from top surface is flush with convex end surface. The utility model discloses steel shell electric core can better realize the control to the size tolerance, the tolerance of the shell size of steel shell electric core is smaller when producing, and the utility model directly uses the size of steel shell electric core as the final size, avoids the tolerance influence when circuit board and electric core body assemble / produce, and because the appearance size of steel shell electric core is final size, makes the available capacity of its internal electric core effectively promote.

Description

Technical Field

[0001] This utility model relates to the field of battery cell packaging, and more particularly to electrochemical devices and electrical equipment. Background Technology

[0002] Battery cells, as an indispensable core component of modern electronic devices, essentially convert chemical energy into electrical energy to power various devices. In daily life, we experience the presence of battery cells almost everywhere, from our mobile phones and cameras that capture precious moments, to laptops and tablets that help us work efficiently—all rely on the stable power provided by battery cells. With their superior performance, battery cells play a crucial role in people's lives and work.

[0003] In existing technologies, in addition to the battery cell itself, a protection board / circuit board is also required at the end of the battery cell. After the protection board is connected to the battery cell, a complete battery structure is formed. As a result, the final battery will have certain tolerances after production. These tolerances come partly from the dimensional tolerances of the battery cell itself, partly from the dimensional tolerances of the protection board, and partly from the tolerances after the battery cell and the protection board are assembled. The combination of these three factors results in a relatively large tolerance range for the final battery. Since the size of the space in the electrical equipment used to house the battery cell is generally relatively fixed, the tolerance dimensions of the final battery must be controlled based on the size of the space.

[0004] To more effectively control tolerances, the connection between the protection board and the battery cell body in existing technologies is usually achieved through injection molding. In this method, the inner cavity space of the injection mold can be consistent with the space of the receiving slot in the electrical equipment that houses the battery cell, thereby effectively improving the consistency of the battery size after injection molding. However, this method also brings new problems. In order to ensure that the injection molding can be fixed, a margin needs to be reserved. That is, in terms of design dimensions, the size of the battery cell and the protection board will be reduced to leave a margin for injection molding and to ensure the consistency of the battery size through final injection molding. This will lead to a reduction in the usable capacity of the battery cell. Utility Model Content

[0005] In order to solve the above-mentioned problems of the prior art, the present invention provides an electrochemical device and an electrical device.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] An electrochemical device includes a battery cell body; the battery cell body is a steel-cased battery cell; the battery cell body includes a top surface and a bottom surface disposed opposite to each other; the top surface is connected to an electrode tab; the electrode tab is connected to a circuit board; the circuit board is disposed parallel to the top surface; a protrusion is formed on the top surface; the protrusion has a raised end face parallel to the top surface; the end face of the circuit board away from the top surface is lower than the plane of the raised end face; the circuit board is covered with an injection-molded part; the end face of the injection-molded part away from the top surface is flush with the raised end face.

[0008] In one embodiment of this utility model, double-sided adhesive is provided between the circuit board and the top surface.

[0009] In one embodiment of this utility model, the distance between the raised end face and the bottom surface is a reference distance A; the end face of the circuit board away from the top surface and the raised end face have a distance B, B≥0.3mm.

[0010] In one embodiment of the present invention, the protrusion has a first surface on the side near the circuit board; the first surface and the circuit board have a distance C, where C≥1mm.

[0011] In one embodiment of the present invention, the battery cell body includes a side surface that is away from the first surface and parallel to the first surface; the side surface and the circuit board have a distance D, where D≥1mm.

[0012] In one embodiment of the present invention, a connecting terminal is provided on the side of the circuit board away from the top surface; a notch is provided on the injection molded part opposite to the connecting terminal; the connecting terminal is exposed from the notch.

[0013] In one embodiment of this utility model, the connecting terminal is located in the middle of the notch; the distance between the connecting terminal and the notch is E, where E≥1mm.

[0014] In one embodiment of this utility model, the protrusion is provided on one side close to the battery cell body.

[0015] In one embodiment of this utility model, a lock hole is connected to the battery cell body.

[0016] An electrical device comprising the electrochemical device described in any one of the preceding claims.

[0017] The beneficial effects of this utility model are: using a steel-cased battery cell allows for better control of dimensional tolerances, resulting in smaller tolerances during the production of the steel-cased battery cell's outer shell dimensions. Furthermore, this utility model directly uses the dimensions of the steel-cased battery cell as the final dimensions, avoiding the influence of tolerances during the assembly / production of the circuit board and the battery cell body. Since the outer dimensions of the steel-cased battery cell are the final dimensions, the usable capacity of the internal battery cell is effectively increased. The accommodating area formed between the protrusion and the top surface is used to accommodate the circuit board, allowing the circuit board to be packaged and fixed using the original process, avoiding the increased production costs brought about by the new process. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural view of the present invention;

[0020] Figure 2 This is the main structural view of this utility model;

[0021] Figure 3 This is a front view of the structure after encapsulation of this utility model;

[0022] Figure 4 This is a front view of a battery structure based on existing technology.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100. Battery cell body; 101. Top surface; 102. Bottom surface; 103. Side surface; 104. Reception area; 105. Lock hole; 110. Protrusion; 111. Protrusion end face; 112. First surface; 120. Electrode tab; 130. Double-sided adhesive; 140. Circuit board; 141. Connecting terminal; 150. Injection molded part; 151. Notch. Detailed Implementation

[0025] 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 a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1-2As shown, the electrochemical device includes a battery cell body 100; the battery cell body 100 is a steel-cased battery cell; the steel casing of the steel-cased battery cell, being a metal component, has better rigidity, and the dimensional tolerances of the machining are easier to control, thus better ensuring the dimensions of the final finished battery cell; the battery cell body 100 includes a top surface 101 and a bottom surface 102 disposed opposite to each other; the top surface 101 is connected to a tab 120; in one embodiment, the tab 120 is typically folded and attached to the top surface 101, thereby reducing space occupation; the tab 120 is connected to a circuit board 140; in another embodiment, the tab 120 can initially protrude from the top surface 101, and after the tab 120 is soldered to the circuit board 140, the tab 120 is folded and attached to the top surface 101, thus facilitating the connection between the tab 120 and the circuit board 140; the circuit board 140 is disposed parallel to the top surface 101.

[0029] In one embodiment, a protrusion 110 is formed on the top surface 101; a receiving area 104 for mounting a circuit board 140 is formed between the protrusion 110 and the top surface 101; the protrusion 110 has a protruding end face 111 parallel to the top surface 101; the end face of the circuit board 140 away from the top surface 101 is lower than the plane where the protruding end face 111 is located; the circuit board 140 is covered by an injection molded part 150; the end face of the injection molded part 150 away from the top surface 101 is flush with the protruding end face 111; the distance between the protruding end face 111 and the bottom surface 102 is a reference distance A. In this embodiment, the protrusion 110 ensures that the battery's length dimension A is based on the cell body 100 itself, reducing the influence of the circuit board 140. This also ensures that the cell body 100 has the maximum design dimension in the length direction, thereby increasing the cell's usable capacity. The end face of the circuit board 140 away from the top surface 101 is lower than the plane of the protruding end face 111, providing ample space for the formation of the injection molded part 150. This ensures that the end face of the final injection molded part 150 away from the top surface 101 is flush with the protruding end face 111, so that the dimension of the injection molded part 150 after being connected to the cell body 100 also has dimension A in the length direction. With this structure, only the height dimension of the circuit board 140 when connected to the top surface 101 needs to be controlled during design. The allowance control of the cell body 100 in the length direction does not need to be considered, reducing accumulated errors and the size of the dimension design allowance, thereby increasing the cell's usable capacity. It should be noted that the difficulty of controlling the dimensions of the cell body 100 in other directions is reduced, and the dimensional deviation range is small, which will not be described in detail here.

[0030] In one embodiment of this utility model, double-sided adhesive 130 is provided between the circuit board 140 and the top surface 101. The double-sided adhesive 130 can stick the circuit board 140 to the top surface 101; in another embodiment, the double-sided adhesive 130 can also provide insulation between the tab 120 and the circuit board 140.

[0031] In one embodiment of this utility model, the end face of the circuit board 140 away from the top surface 101 and the raised end face 111 have a distance B, where B ≥ 0.3 mm. See also Figure 2 The distance between the top surface 101 and the bottom surface 102 is F, and the maximum distance between the circuit board 140 and the top surface 101 is G; see [link / reference] Figure 4 Understandably, in the existing technology, the battery cell lacks the protrusion 110 structure, and the top surface 101 is a complete plane. In the existing technology, the battery cell has a length dimension F', the maximum distance between the circuit board 140 and the top surface 101 is G', the target size of the battery cell is A, and the injection molding allowance is B', i.e., A = F' + G' + B'. To ensure the existence of B', the sum of F' and G' must be relatively small. However, the dimensional tolerance of G' is related to assembly and welding and cannot be directly reduced. The only way to ensure the existence of B' is to reduce the size of F. This results in the design size of F' being smaller than the size of F, which in turn makes the size of B' larger than the size of B. In other words, the design allowance in the existing technology is larger, requiring more space to be reserved for filling with the injection molded part 150. This increases the amount of injection molded part 150 used and reduces the usable capacity of the battery cell. In actual production, B' in the existing technology is ≥ 1mm.

[0032] In one embodiment of the present invention, the protrusion 110 has a first surface 112 on the side near the circuit board 140; the first surface 112 and the circuit board 140 have a distance C, C≥1mm, to ensure that the distance C can prevent the size of the circuit board 140 from exceeding the top surface 101, and can ensure that the circuit board 140 can be better wrapped by the injection molded part 150, thereby improving the connection strength between the injection molded part 150 and the battery cell body 100.

[0033] In one embodiment of the present invention, the battery cell body 100 includes a side surface 103 that is away from the first surface 112 and parallel to the first surface 112; the side surface 103 and the circuit board 140 have a distance D, D≥1mm, which ensures that the distance D can wrap the edge of the circuit board 140 in the injection molded part 150, thereby improving safety and reliability.

[0034] like Figure 3As shown, in one embodiment of this utility model, a connecting terminal 141 is provided on the side of the circuit board 140 away from the top surface 101; a notch 151 is provided on the injection molded part 150 opposite to the connecting terminal 141; the connecting terminal 141 protrudes from the notch 151. The connecting terminal 141 is located in the middle of the notch 151; the distance between the connecting terminal 141 and the notch 151 is E, where E ≥ 1 mm. By providing the notch 151, the mold can easily seal the injection molding compound, preventing the injection molding compound from accidentally molding the connecting terminal 141; by controlling the distance E, a safe distance between the injection molding compound and the connecting terminal 141 is ensured.

[0035] In one embodiment of the present invention, the protrusion 110 is provided and is located on one side close to the battery cell body 100.

[0036] In one embodiment of this utility model, a lock hole 105 is connected to the battery cell body 100.

[0037] An electrical device, characterized in that it includes the electrochemical device described in any one of the above claims.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An electrochemical device, characterized in that: The device includes a battery cell body (100); the battery cell body (100) is a steel-cased battery cell; the battery cell body (100) includes a top surface (101) and a bottom surface (102) disposed opposite to each other; the top surface (101) is connected to a tab (120); the tab (120) is connected to a circuit board (140); the circuit board (140) is disposed parallel to the top surface (101); a protrusion (110) is formed on the top surface (101); the protrusion (110) is provided with a protruding end face (111) parallel to the top surface (101); the end face of the circuit board (140) away from the top surface (101) is lower than the plane of the protruding end face (111); the circuit board (140) is covered with an injection molded part (150); the end face of the injection molded part (150) away from the top surface (101) is flush with the protruding end face (111).

2. The electrochemical device according to claim 1, characterized in that: Double-sided adhesive tape (130) is provided between the circuit board (140) and the top surface (101).

3. The electrochemical device according to claim 1, characterized in that: The distance between the raised end face (111) and the bottom surface (102) is a reference distance A; the end face of the circuit board (140) away from the top surface (101) and the raised end face (111) have a distance B, B≥0.3mm.

4. The electrochemical device according to claim 1, characterized in that: The protrusion (110) has a first surface (112) on the side near the circuit board (140); the first surface (112) and the circuit board (140) have a distance C, C≥1mm.

5. The electrochemical device according to claim 4, characterized in that: The battery cell body (100) includes a side surface (103) that is away from the first surface (112) and parallel to the first surface (112); the side surface (103) and the circuit board (140) have a distance D, where D≥1mm.

6. The electrochemical device according to claim 1, characterized in that: A connection terminal (141) is provided on the side of the circuit board (140) away from the top surface (101); a notch (151) is provided on the injection molded part (150) opposite to the connection terminal (141); the connection terminal (141) is exposed from the notch (151).

7. The electrochemical device according to claim 6, characterized in that: The connecting terminal (141) is located in the middle of the notch (151); the distance between the connecting terminal (141) and the notch (151) is E, where E ≥ 1 mm.

8. The electrochemical device according to claim 1, characterized in that: The protrusion (110) is provided on one side close to the battery cell body (100).

9. The electrochemical device according to claim 1, characterized in that: A lock hole (105) is connected to the battery cell body (100).

10. An electrical appliance, characterized in that, Includes the electrochemical device as described in any one of claims 1 to 9.

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