Energy storage battery pack assembly and electric connection sheet thereof

Abstract

The utility model discloses an electric connection sheet, comprising an electric connection sheet base body and a plurality of welding units, the electric connection sheet base body is provided with a plurality of hollow parts, and the welding units are respectively arranged in the hollow parts and are electrically connected with the electric connection sheet base body. Each welding unit comprises at least two welding elastic pieces which are separated from each other, and the positions, electrically connected with the electric connection base body, of the welding elastic pieces in each welding unit are located on different edges of the hollowed-out part respectively. The utility model further discloses an energy storage battery pack assembly which comprises an electric connecting piece, a support and a plurality of battery cell strings, the battery cell strings are fixed together side by side through the support, and all the welding units are connected with all the battery cell strings in a welding mode so that the positive electrodes and the negative electrodes of all the battery cell strings can be connected and conducted. According to the energy storage battery pack assembly and the electric connecting piece thereof, the through-current capacity between the electric connecting piece and the battery cell string can be effectively improved, and the product quality and competitiveness are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, and in particular to an energy storage battery pack assembly and an electrical connecting sheet thereof. Background Art

[0002] The cells in the energy storage battery pack are designed in series and parallel to achieve specific voltage and current values, meeting parameters such as the power performance of the entire machine.

[0003] In energy storage battery pack products, the electrical connector is manufactured into a part that matches the corresponding battery pack, so that the same part can be welded to the positive and negative electrodes of adjacent battery cell strings in the energy storage battery pack to achieve positive and negative connection and conduction between battery cell strings. Among them, the quality of the current flow of the welding part between the electrical connector and the positive and negative electrodes of the battery cell string is very critical to the performance quality of the entire battery pack. However, the current flow capacity of the welding part between the existing electrical connector and the positive and negative electrodes of the battery cell string is poor, and the current flow capacity cannot be effectively improved in a limited area, resulting in poor product quality and competitiveness.

[0004] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Utility Model Content

[0005] In order to solve the above technical problems, the utility model proposes an energy storage battery pack assembly and an electrical connecting piece thereof, which can effectively improve the current carrying capacity between the electrical connecting piece and the battery string, and improve product quality and competitiveness.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In the first aspect, the utility model discloses an electrical connecting sheet, comprising an electrical connecting sheet substrate and a plurality of welding units, wherein the electrical connecting sheet substrate is provided with a plurality of hollow portions, each of the welding units is respectively arranged in each of the hollow portions and electrically connected to the electrical connecting sheet substrate, each of the welding units comprises at least two welding spring sheets separated from each other, and the positions where each of the welding spring sheets in each of the welding units is electrically connected to the electrical connecting sheet substrate are respectively located on different sides of the hollow portions.

[0008] In a further solution, each of the welding units includes two welding springs, and the hollow portion is a rectangular structure.

[0009] In a further solution, the positions where the two welding springs are electrically connected to the electrical connection base are respectively located at adjacent sides of the hollow portion.

[0010] In a further embodiment, the positions where the two welding springs are electrically connected to the electrical connection base are respectively located at opposite sides of the hollow portion.

[0011] In a further embodiment, each of the welding units includes N welding springs, and the hollow portion is an N-sided structure, and the positions where each welding spring is electrically connected to the electrical connection base are correspondingly located at each side of the hollow portion, and N is an integer greater than or equal to 3.

[0012] In a further solution, adjacent sides of the welding springs of each welding unit are parallel to each other and are arranged obliquely relative to the side of the hollow portion.

[0013] In a further solution, the electrical connection sheet substrate and each of the welding spring sheets are integrally formed.

[0014] In a further solution, the electrical connection plate substrate and each of the welding springs are made of sheet metal.

[0015] In a further solution, the electrical connection sheet substrate and each of the welding springs are made of nickel sheets.

[0016] In the second aspect, the utility model discloses an energy storage battery pack assembly, comprising the electrical connecting piece, the bracket and a plurality of battery cell strings described in the first embodiment, wherein the bracket fixes the plurality of battery cell strings together in parallel, and each of the welding units is respectively welded to each of the battery cell strings so that the positive and negative poles of each of the battery cell strings are connected and conductive.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the energy storage battery pack assembly and its electrical connecting sheet disclosed by the present invention, wherein each welding unit includes a plurality of mutually separated welding spring sheets, and each welding spring sheet is respectively connected to different sides of the hollow portion. On the one hand, the total length of the connecting side between each welding unit and the electrical connecting sheet substrate can be effectively increased, thereby effectively improving the flow capacity between the electrical connecting sheet and the battery cell string, and improving product quality and competitiveness; on the other hand, when the battery cell string is working, the positive current can flow to the negative electrode from multiple directions, so that the area through which the current flows on the point connecting sheet substrate is greatly increased, thereby also greatly reducing the internal resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the electrical connecting piece in the first embodiment of the utility model;

[0019] Figure 2 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0020] Figure 3 It is a structural schematic diagram of the energy storage battery pack assembly in the second embodiment of the present utility model;

[0021] Figure 4 yes Figure 3 Schematic diagram of the structure of the medium energy storage battery pack assembly before the electrical connection plate is assembled. DETAILED DESCRIPTION

[0022] The following is a detailed description of the implementation of the utility model. It should be emphasized that the following description is only exemplary and is not intended to limit the scope and application of the utility model.

[0023] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit / signal communication.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] like Figure 1 and Figure 2 As shown, the first embodiment of the utility model discloses an electrical connecting sheet 10, including an electrical connecting sheet substrate 11 and a plurality of welding units 12, the electrical connecting sheet substrate 11 is provided with a plurality of hollow portions 111, each welding unit 12 is respectively arranged in each hollow portion 111 and electrically connected to the electrical connecting sheet substrate 11, each welding unit 12 includes at least two mutually separated welding spring pieces 121, and the positions where each welding spring piece 121 in each welding unit 12 is electrically connected to the electrical connecting sheet substrate 11 are respectively located on different sides of the hollow portion 111.

[0027] The formula for the current carrying capacity of the electrical connection piece is: I = K × dT α ×S β, where I is the current carrying capacity of the electrical connector, in ampere (A); K is a constant that depends on the material and structure of the electrical connector; dT is the temperature rise of the electrical connector, in degrees Celsius (℃); S is the cross-sectional area of ​​the electrical connector, in square millimeters (mm 2 ); α and β are exponents, which depend on the material and structure of the electrical connection sheet. It can be seen that by locating the positions where each welding spring 121 in each welding unit 12 is electrically connected to the electrical connection substrate 11 at different sides of the hollow portion 111, the connection length between the welding spring 121 and the electrical connection sheet substrate 11 can be increased. Under the condition of the same thickness, the cross-sectional area S of the electrical connection sheet is increased, thereby further improving the flow capacity of the electrical connection sheet 10 and achieving the function of reducing the internal resistance of the battery pack; further, when the battery cell is working, the loss is small, the heat generation of the battery pack is low, the temperature rise of the battery pack is reduced, the service life of the battery cell and the temperature range of the whole machine are increased, thereby improving product quality and competitiveness.

[0028] In this embodiment, each welding unit 12 includes two welding springs 121, and the hollow portion 111 is a rectangular structure; the positions where the two welding springs 121 are electrically connected to the electrical connection base 11 are respectively located at the opposite sides of the hollow portion 111. And the adjacent sides between the two welding springs 121 are parallel to each other and are inclined relative to the side of the hollow portion 111. For example, in this embodiment, the two welding springs 121 are respectively similar to a triangle structure, and the total connection side length of the sum of the two opposite sides of the hollow portion 111 is relatively long, thereby greatly improving the flow performance of the edge connection. Figure 2 It can be seen that the total length of the electrical connection between each welding spring piece 121 in each welding unit 12 and the electrical connection base 11 is M1+M2. Under the same conditions, the connection length is significantly increased compared to connecting each welding spring piece 121 to the same side of the hollow portion 111, thereby improving the current carrying capacity of the electrical connection sheet 10 and achieving the function of reducing the internal resistance of the battery pack.

[0029] The electrical connection plate substrate 11 and each welding spring piece 121 are integrally formed, and both the electrical connection plate substrate 11 and each welding spring piece 121 are made of sheet metal, such as nickel sheet, nickel-plated steel sheet, aluminum sheet, etc.

[0030] In other embodiments, the positions where the two welding springs 121 are electrically connected to the electrical connection base 11 can also be located at adjacent sides of the hollow portion 111. In this case, the total length of the electrical connection between each welding spring 121 in each welding unit 12 and the electrical connection base 11 is still significantly longer than the connection length of connecting each welding spring 121 to the same side of the hollow portion 111, thereby improving the current carrying capacity of the electrical connection sheet 10 and achieving the function of reducing the internal resistance of the battery pack.

[0031] In some other embodiments, each welding unit includes N welding springs, and the hollow portion is an N-gonal structure, and the positions where each welding spring is electrically connected to the electrical connection base are respectively located at the sides of the hollow portion, and N is an integer greater than or equal to 3. Furthermore, the adjacent sides between each welding spring are parallel to each other and are inclined relative to the side of the hollow portion. For example, each welding spring can be a triangular structure, and N mutually spaced welding springs are roughly combined to form the shape of an N-gonal structure. At this time, the total length of the electrical connection between each welding spring 121 in each welding unit 12 and the electrical connection base 11 is more significantly increased than the connection length of each welding spring 121 connected to the same side of the hollow portion 111, thereby improving the current carrying capacity of the electrical connection sheet 10 and achieving the function of reducing the internal resistance of the battery pack.

[0032] like Figure 3 and Figure 4 As shown, the second embodiment of the present invention discloses an energy storage battery pack assembly, including the electrical connection sheet 10, the bracket 20 and a plurality of battery cell strings 30 in the first embodiment, the bracket 20 fixes the plurality of battery cell strings 30 in parallel, and each welding unit 12 is welded to each battery cell string 30 to make the positive and negative electrodes of each battery cell string 30 connected and conductive. Among them, each welding spring sheet 121 is welded to each battery cell string 30 through a welding point 1211.

[0033] In the energy storage battery pack assembly of this embodiment, after the electrical connection sheet 10 in the first embodiment is electrically connected and assembled with a plurality of battery cell strings 30, since the welding spring sheet 121 (i.e., the welding portion between the battery cell string 30 and the electrical connection sheet 10) is connected to the electrical connection sheet substrate 11 on two or more sides, not only the connection length of each welding spring sheet 121 connected to the same side of the hollow portion 111 is increased, thereby improving the current carrying capacity of the electrical connection sheet 10; and when the battery cell string 30 is working, the positive electrode current flows to the negative electrode from two or more directions, such as Figure 3 As shown in the current flow direction 40, when the current in each battery string 30 flows to the negative electrode from multiple directions, the area through which the current flows on the electrical connection sheet substrate 11 is greatly increased, that is, the internal resistance is greatly reduced. Therefore, in the energy storage battery pack assembly provided by this embodiment, by setting the welding spring 121 (i.e., the welding part between the battery string 30 and the electrical connection sheet 10) and the electrical connection sheet substrate 11 to be connected on two or more sides, not only the current carrying capacity of the electrical connection sheet 10 is improved, but also the current flow area is increased to improve the positive effect.

[0034] The energy storage battery pack assembly and the electrical connecting piece thereof provided by the utility model, on the one hand, realize a doubling of the current carrying capacity of the electrical connecting piece, greatly increase the area through which the current flows on the electrical connecting piece substrate, reduce the internal resistance at the welding point between the electrical connecting piece and the battery cell string, reduce the electric heat at the welding point, reduce the damage to the battery cell string, and improve the service life of the battery cell string; on the other hand, the additional heat generated by the internal resistance is reduced, the allowable ambient temperature is correspondingly increased, and the operating temperature range is expanded; thereby, the service life of the energy storage battery pack assembly and the temperature operating range of the whole machine are improved, and the product quality and competitiveness are improved.

[0035] The background section of the utility model may contain background information about the problem or environment of the utility model, rather than describing the prior art by others. Therefore, the content contained in the background technology section is not an admission of the applicant to the prior art.

[0036] The above content is a further detailed description of the utility model in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, it can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the protection scope of the utility model. In the description of this specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily target 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 manner. In addition, in the absence of mutual contradiction, the technical personnel in this field can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope defined by the appended claims.

Claims

1. An electrical connecting sheet, characterized in that: It includes an electrical connection sheet substrate and multiple welding units, the electrical connection sheet substrate is provided with multiple hollow parts, each of the welding units is respectively arranged in each of the hollow parts and electrically connected to the electrical connection sheet substrate, each of the welding units includes at least two mutually separated welding springs, and the positions where each of the welding springs in each of the welding units is electrically connected to the electrical connection substrate are respectively located on different sides of the hollow parts.

2. The electrical connecting sheet according to claim 1, characterized in that: Each of the welding units includes two welding springs, and the hollow portion is a rectangular structure.

3. The electrical connecting sheet according to claim 2, characterized in that: The positions where the two welding springs are electrically connected to the electrical connection base are respectively located at adjacent sides of the hollow portion.

4. The electrical connecting sheet according to claim 2, characterized in that: The positions where the two welding springs are electrically connected to the electrical connection base are respectively located at opposite sides of the hollow portion.

5. The electrical connecting sheet according to claim 1, characterized in that: Each of the welding units includes N welding springs, and the hollow portion is an N-sided structure. The positions where each welding spring is electrically connected to the electrical connection base are correspondingly located at each side of the hollow portion, and N is an integer greater than or equal to 3.

6. The electrical connecting sheet according to any one of claims 1 to 5, characterized in that: The adjacent sides of the welding springs of each welding unit are parallel to each other and are arranged obliquely relative to the side of the hollow portion.

7. The electrical connecting sheet according to any one of claims 1 to 5, characterized in that: The electrical connection sheet substrate and each of the welding spring sheets are integrally formed.

8. The electrical connecting sheet according to any one of claims 1 to 5, characterized in that: The electric connection plate substrate and each welding spring are made of sheet metal.

9. The electrical connecting sheet according to any one of claims 1 to 5, characterized in that: The electric connection sheet substrate and each welding spring sheet are made of nickel sheets.

10. An energy storage battery pack assembly, characterized in that: It comprises the electrical connecting piece, bracket and multiple battery cell strings as described in any one of claims 1 to 9, wherein the bracket fixes the multiple battery cell strings together in parallel, and each welding unit is welded and connected to each battery cell string respectively so that the positive and negative electrodes of each battery cell string are connected and conductive.

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