Battery pack
By combining the thermally conductive acceleration part and insert injection molding structure between the bus bar and the monomer holder, the heat dissipation problem of bus bar and battery cell in the battery pack is solved, rapid heat transfer and effective heat dissipation are achieved, and the safety of the battery pack is improved.
Patent Information
- Application Number
- CN202510008916.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-01-19
- Filing Date
- 2025-01-03
- Publication Date
- 2025-07-22
AI Technical Summary
The heat dissipation problems of bus bars and battery cells in the battery pack have become a safety hazard, especially at high capacity and high charging/discharge rates, which are difficult to effectively solve.
By using an insert injection molding structure between the bus bar and the monomer holder, combined with the thermally conductive acceleration part, the contact area and thermal conductivity are increased, and the heat dissipation plastic material with good thermal conductivity can be used to achieve rapid heat transfer.
Effectively suppress overheating of bus bars and battery cells, improve heat dissipation efficiency, prevent sharp rise in temperature, and ensure the safety of the battery pack.
Smart Images
Figure CN120357073A_ABST
Abstract
Description
Technical Field
[0001] One or more embodiments relate to a battery pack, and more particularly, to a battery pack including a bonding structure of a bus bar and a cell holder. Background Art
[0002] A secondary battery can be charged and discharged, unlike a primary battery that cannot be recharged. Low-capacity secondary batteries are used in small portable electronic devices such as smart phones, feature phones, laptop computers, digital cameras, and camcorders. High-capacity secondary batteries are used as motor drive power sources, storage batteries, etc. in hybrid electric vehicles, electric vehicles, and the like. Such a secondary battery may include an electrode assembly including a cathode and an anode, a case accommodating the electrode assembly, electrode terminals connected to the electrode assembly, and the like.
[0003] Generally, a battery pack can be used as an energy storage system (ESS) or in an electric vehicle (EV) to store energy. EVs may include hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), and the like.
[0004] Due to the increased capacity and high charge / discharge C-rate of the battery pack, heat dissipation of the bus bar and battery cells in the battery pack may become a safety hazard. Therefore, thermal management is important in the development of battery packs.
[0005] The above information is used as the background of the present disclosure and is only for enhancing the understanding of the present disclosure, and thus may include information that does not constitute the prior art. Summary of the Invention
[0006] One or more embodiments include a battery pack that can effectively dissipate heat generated by a bus bar and battery cells, which are components of the battery pack, by improving the bonding structure of the bus bar and the cell holder.
[0007] However, the technical problems to be solved by the present disclosure are not limited to the above problems, and other problems not mentioned herein can be clearly understood by those of ordinary skill in the art from the description of the present disclosure.
[0008] Additional aspects will be set forth in part in the description which follows, and will be apparent from the description, or may be learned by practice of the presented embodiments of the present disclosure.
[0009] According to one or more embodiments, a battery pack includes a bus bar electrically connecting a plurality of battery cells and a cell holder fixing the bus bar, wherein the cell holder is bonded to the bus bar as an insert injection molding structure, and the bus bar includes a heat conduction acceleration portion formed in a portion of the bus bar bonded to the cell holder.
[0010] The heat conduction acceleration part can be formed in the edge part of the bus bar.
[0011] The heat conduction acceleration part can include an edge in a square wave shape.
[0012] The heat conduction acceleration part can include a plurality of holes extending between the bottom surface and the top surface of the bus bar.
[0013] The plurality of holes can be arranged in a line.
[0014] The plurality of holes can be arranged in a zigzag pattern.
[0015] The heat conduction acceleration part can include an edge in a sine wave shape.
[0016] The monomer holder can include heat-dissipating plastic. Description of the Drawings
[0017] Through the following description in conjunction with the drawings, the above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent.
[0018] Figure 1 The structure of a battery pack in which a monomer holder and a bus bar are assembled according to an embodiment of the present disclosure is shown;
[0019] Figure 2 is Figure 1 An exploded perspective view of the shown assembly, in which one bus bar is separated;
[0020] Figure 3 is along Figure 1 The cross-sectional view taken along line III-III in;
[0021] Figure 4 is along Figure 1 The cross-sectional view taken along line IV-IV in;
[0022] Figure 5 shows Figure 1 An example of the structure of the bus bar in;
[0023] Figure 6 shows corresponding to Figure 5 Another example;
[0024] Figure 7 shows corresponding to Figure 5 Another example; and
[0025] Figure 8 shows corresponding to Figure 5 Another example. Detailed Description
[0026] Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals always refer to like elements. In this regard, the present embodiments may have different forms and should not be construed as limited to the descriptions set forth herein. Accordingly, the embodiments are described below only by referring to the accompanying drawings to explain aspects of the present specification. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0027] The terms and words used in this specification and the claims should not be construed as limited to ordinary or dictionary meanings, and should be interpreted as meanings and concepts consistent with the technical idea of the present disclosure based on the concept that the inventor can appropriately define the terms to best describe the principles of his invention. Accordingly, it should be understood that the configurations shown in the drawings and embodiments described in this specification are merely the most preferred embodiments of the present disclosure and do not represent all the technical ideas of the present disclosure, such that there may be various equivalents and modifications that replace them at the time of filing this application. If used herein, "comprise, include" and / or "comprising, including" specify the presence of the recited shape, quantity, step, operation, member, part, and / or group thereof, and do not preclude the presence or addition of one or more different shapes, quantities, operations, members, parts, and / or groups. If an embodiment of the present disclosure is described, "able to" or "may" may include "one or more embodiments of the present disclosure".
[0028] To assist in understanding the present disclosure, the accompanying drawings are not drawn to actual scale and the dimensions of some components may be exaggerated. In different embodiments, the same reference numerals may be assigned to the same components.
[0029] A statement that two comparison targets are "the same" as each other may mean that they are "substantially the same" as each other. Accordingly, the case where they are "substantially the same" as each other may include the case where they have a deviation regarded as a low level (e.g., a deviation of 5% or less). If a uniform parameter is uniform in a predetermined region, it may mean that it is uniform from an average perspective.
[0030] Although various components may be described using first, second, etc., these components are not limited by these terms. These terms are only used to distinguish one component from other components, and unless otherwise specifically stated to the contrary, the first component may be the second component.
[0031] Throughout the specification, unless otherwise specifically stated to the contrary, each component may be singular or plural.
[0032] If a component is arranged “on the top (or bottom) part” of another component or “above (or below)” another component, it may not only mean the case where the component is arranged adjacent to the top surface (or bottom surface) of the other component, but also mean the case where another component may be interposed between the other component and the component arranged above (or below) the other component.
[0033] When a component is described as “linked”, “coupled” or “connected” to another component, it should be understood that these components are directly connected or connectable to each other, but another component may be “interposed” between these components, or these components may be “linked”, “coupled” or “connected” to each other through another component. If a part is electrically coupled to another part, this may include not only the case where they are directly connected to each other, but also the case where they are connected to another element therebetween.
[0034] Throughout the specification, unless otherwise specifically stated, “A and / or B” may represent A, B, or A and B. That is, “and / or” may include all or any combination of the listed items. Unless otherwise specifically stated, “C to D” may mean at least C but not exceeding D.
[0035] Figure 1 The structure of a battery pack in which a monomer holder and a bus bar are assembled according to an embodiment of the present disclosure is shown. Figure 2 is Figure 1 an exploded perspective view of the shown assembly, in which one bus bar is separated. Figure 3 is a cross-sectional view taken along Figure 1 line III-III in Figure 4 is a cross-sectional view taken along Figure 1 line IV-IV in Figure 5 shows Figure 1 an example of the structure of the bus bar in Figure 6 shows another example corresponding to Figure 5 Figure 7 shows another example corresponding to Figure 5 Figure 8 shows another example corresponding to Figure 5
[0036] Referring to Figures 1 to 8 , the battery pack 10 according to the present disclosure may include battery cells 20, bus bars 30, monomer holders 40, and a heat conduction acceleration part 50.
[0037] The battery cells 20 may be provided as a plurality. That is, the plurality of battery cells 20 may be arranged, for example, in a regular pattern in a housing. The battery cells 20 may be prismatic battery cells. The battery cells 20 may be lithium-ion battery cells.
[0038] The bus bar 30 can be a component that electrically connects multiple battery cells 20. The bus bar 30 can be manufactured in various forms. The bus bar 30 can include a metal with good electrical conductivity. Multiple bus bars 30 coupled to the cell holder 40 can be provided. The shapes of the multiple bus bars 30 can be different.
[0039] The cell holder 40 can be a structure for fixing the battery cell 20 in a specific position. The cell holder 40 can also fix the bus bar 30. The cell holder 40 can be manufactured using a synthetic resin. The cell holder 40 can include a heat-dissipating plastic. The heat-dissipating plastic generally can include a synthetic resin with excellent thermal conductivity. The cell holder 40 can be manufactured using, for example, polyamide, polycarbonate, polyphenylene sulfide, polybutylene terephthalate, polyetherimide, etc. The cell holder 40 can be manufactured by injection molding. The bus bar 30 and the cell holder 40 can be coupled by insert injection molding. The bus bar 30 can be prevented from moving by the cell holder 40 and maintained in a stable position. The heat conduction acceleration part 50 can include a structure in which the bus bar 30 and the cell holder 40 are coupled by insert injection molding.
[0040] The heat conduction acceleration part 50 can be a structure for accelerating heat conduction from the bus bar 30 to the cell holder 40. The heat conduction acceleration part 50 can include a structure for increasing the contact area between the bus bar 30 and the cell holder 40. The detailed structure of the heat conduction acceleration part 50 can be implemented in various forms.
[0041] The heat conduction acceleration part 50 can be formed in the edge part of the bus bar 30. For example, as Figure 5 shown, the heat conduction acceleration part 50 can have an edge with a square wave shape. The heat conduction acceleration part 50 can increase the speed at which heat is conducted from the bus bar 30 to the cell holder 40. The heat conduction acceleration part 50 can also improve the bonding force between the bus bar 30 and the cell holder 40.
[0042] The heat conduction acceleration part 50 can include, for example, multiple holes as Figure 6 shown. The holes can be formed to penetrate from the top surface to the bottom surface of the bus bar 30. If the heat conduction acceleration part 50 includes multiple holes, the multiple holes can be arranged in a line. The multiple holes can also be arranged in a zigzag pattern, as Figure 7 shown.
[0043] The heat conduction acceleration part 50 can have an edge with a sine wave shape, for example, as Figure 8 shown.
[0044] The above embodiments of the heat conduction acceleration part 50 are examples, and various forms of structures can be included as part of the heat conduction acceleration part 50 to increase the heat conduction speed in the connection part from the bus bar 30 to the cell holder 40.
[0045] Hereinafter, the working effect of the present disclosure will be described in detail by taking as an example the case of thermally managing the battery cells 20 or the bus bars 30 during repeated charge / discharge processes in the battery pack 10 including the above components.
[0046] Multiple battery cells 20 of the battery pack 10 can generate heat during the charge / discharge process. The heat generated in the battery cells 20 can be transferred to the surrounding environment through a structure physically connected to the battery cells 20. For example, the bus bar 30 physically contacts the battery cells 20, so that the heat generated in the battery cells 20 can be conducted to the bus bar 30. The heat of the bus bar 30 can be transferred to the cell holder 40 physically connected to the bus bar 30. Since the cell holder 40 is formed of a synthetic resin, the cell holder 40 may have a lower thermal conductivity than that of the bus bar 30, and the bus bar 30 may be formed of metal. However, if the cell holder 40 and the bus bar 30 are combined into an insert injection molding structure as in the present disclosure, the contact area between the bus bar 30 and the cell holder 40 increases. In addition, according to the present disclosure, by including the thermal conductivity acceleration part 50, the thermal conductivity efficiency from the bus bar 30 to the cell holder 40 can be significantly improved compared with a conventional battery pack. Therefore, the heat from the bus bar 30 can be quickly conducted to the cell holder 40, thereby preventing the overheating of the bus bar 30. Since the cell holder 40 has a larger surface area and a large heat capacity than the bus bar 30, the temperature of the cell holder 40 may not rise sharply in a short time. In addition, due to the large surface area of the cell holder 40, the heat exchange with the surrounding air can also be significant. In addition, if the cell holder 40 includes a heat-dissipating plastic with excellent thermal conductivity, the speed of heat transfer from the bus bar 30 to the cell holder 40 can be further increased, thereby preventing the overheating of the bus bar 30 and the battery cells 20.
[0047] In the battery pack according to the present disclosure, the cell holder and the bus bar are integrally combined into an insert injection molding structure, and the joint between the cell holder and the bus bar includes a thermal conductivity acceleration part, so that heat can be quickly and effectively transferred from the bus bar to the cell holder structure with a large heat capacity. Therefore, the overheating of the bus bar and the battery cells can be suppressed. In addition, the heat transferred to the cell holder through the thermal conductivity acceleration part is exchanged with air and thus dissipated effectively.
[0048] In addition, as in the embodiment of the present disclosure, if the cell holder includes a heat-dissipating plastic, the heat transfer from the bus bar to the cell holder can be performed more effectively.
[0049] Although the present disclosure has been described by way of limited embodiments and the accompanying drawings, the present disclosure is not limited thereto, and those of ordinary skill in the art can make various modifications and changes within the scope of the technical spirit of the present disclosure and the equivalents of the claims set forth below.
[0050] According to the present disclosure, the monomer holder and the bus bar are integrally combined into an insert injection molding structure, and the joint between the monomer holder and the bus bar includes a heat conduction acceleration portion, so as to quickly and effectively transfer heat from the bus bar to the monomer holder structure with a large heat capacity, and thus effectively suppress the overheating of the bus bar and the battery monomer. In addition, the heat transferred to the monomer holder through the heat conduction acceleration portion is exchanged with the air, whereby the heat is effectively dissipated.
[0051] In addition, as in the embodiments of the present disclosure, if the monomer holder includes a heat-dissipating plastic, the heat transfer from the bus bar to the monomer holder can be performed more effectively.
[0052] The effects that can be obtained through the present disclosure are not limited to the above effects, and those of ordinary skill in the art can clearly understand other technical effects not mentioned from the description of the present disclosure described herein.
[0053] It should be understood that the embodiments described herein should be considered only in a descriptive sense and not for purposes of limitation. The description of features or aspects within each embodiment should generally be considered available for other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, those of ordinary skill in the art will understand that various changes in form and detail can be made therein without departing from the spirit and scope of the present disclosure as set forth in the appended claims.
Claims
1. A battery pack, comprising: A bus bar electrically connecting a plurality of battery cells; And A cell holder fixing the bus bar, Wherein the cell holder is joined to the bus bar as an insert molding structure, and Wherein the bus bar includes a heat conduction acceleration portion formed in a portion of the bus bar joined to the cell holder.
2. The battery pack according to claim 1, wherein, The heat conduction acceleration portion is formed in an edge portion of the bus bar.
3. The battery pack according to claim 2, wherein, The heat conduction acceleration portion includes an edge in a square wave shape.
4. The battery pack according to claim 2, wherein, The heat conduction acceleration portion includes a plurality of holes extending between a top surface and a bottom surface of the bus bar.
5. The battery pack according to claim 4, wherein The plurality of holes are arranged in a line.
6. The battery pack according to claim 4, wherein, The plurality of holes are arranged in a zigzag pattern.
7. The battery pack according to claim 2, wherein, The heat conduction acceleration portion includes an edge in a sine wave shape.
8. The battery pack according to claim 1, wherein, The cell holder includes heat dissipating plastic.
9. A battery pack, comprising: A bus bar electrically connecting a plurality of battery cells; And A cell holder fixing the bus bar, Wherein the cell holder is joined to the bus bar, and Wherein the bus bar includes a heat conduction acceleration portion formed in a portion of the bus bar joined to the cell holder.
10. The battery pack according to claim 9, wherein, The heat conduction acceleration portion is formed in an edge portion of the bus bar.
11. The battery pack according to claim 10, wherein, The heat conduction acceleration portion includes an edge in a square wave shape.
12. The battery pack according to claim 10, wherein, The heat conduction acceleration portion includes a plurality of holes extending between a top surface and a bottom surface of the bus bar.
13. The battery pack according to claim 12, wherein, The plurality of holes are arranged in a line.
14. The battery pack according to claim 12, wherein, The plurality of holes are arranged in a zigzag pattern.
15. The battery pack according to claim 10, wherein, The heat conduction acceleration portion includes an edge in a sine wave shape.
16. The battery pack according to claim 9, wherein, The cell holder includes heat dissipating plastic.