Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, and the battery module comprises an output pole piece which is provided with a connecting through hole penetrating along a first direction; the first fastener comprises a fastener main body and a lug boss connected with the fastener main body; the fastener body is arranged on one side of the output pole piece in the first direction, at least part of the protruding part extends into the connecting through hole, and the protruding part is used for covering the inner surface of the connecting through hole; an inner hole penetrating to the fastener body in the first direction is formed in the protruding part. According to the battery module and the battery pack provided by the invention, the inner surface of the connecting through hole can be covered and protected by the lug boss extending into the connecting through hole, so that the risk of short circuit of the battery module is reduced, and the electrical safety of the battery module is ensured. The protruding part and the fastener body are fixedly connected into a whole, and after the protruding part is inserted into the connecting through hole, the fastener body and the connecting through hole can be positioned and aligned, so that the assembly difficulty is reduced, the assembly steps are simplified, and the assembly cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery module and a battery pack. Background Art

[0002] In the design of new energy vehicle battery systems, in order to achieve electrical connection between two battery modules, an electrical connector is connected between the high-voltage output poles of the two battery modules.

[0003] In the related art, through holes are usually provided in the high-voltage output pole and the electrical connector, and the electrical connector is connected to the high-voltage output pole by bolt connection. However, since the material of the high-voltage output pole is mostly a material with low hardness (for example, copper), the high-voltage output pole may be scratched and damaged when the bolt passes through the through hole, thereby posing a safety hazard to the electrical safety of the entire battery system. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a battery module and a battery pack.

[0005] Based on the above-mentioned purpose, the first aspect of the present application provides a battery module, including: an output pole piece, which is provided with a connecting through-hole extending along a first direction; a first fastener, including a fastener body, and a protrusion fixedly connected to the fastener body; the fastener body is arranged on one side of the output pole piece along the first direction, and at least part of the protrusion extends into the connecting through-hole, and the protrusion is used to cover the inner surface of the connecting through-hole; an inner hole is opened in the protrusion and extends to the fastener body along the first direction.

[0006] Optionally, the hardness of the protrusion is greater than the hardness of the output pole piece.

[0007] Optionally, the protrusion is constructed as a steel structure.

[0008] Optionally, the fastener body and the protrusion are constructed as an integrally formed part.

[0009] Optionally, the protrusion is embedded in the connecting through hole.

[0010] Optionally, the protrusion is loosely matched with the connecting through hole.

[0011] Optionally, a fastening hole is provided in the fastener body, and the fastening hole is communicated with the inner hole.

[0012] Optionally, the fastener body is a nut, and the raised portion is configured as a sleeve structure.

[0013] Optionally, the battery module further includes: an end plate and a bus bracket; wherein the fastener body is embedded in the end plate or the bus bracket, and the protrusion extends out of the upper surface of the end plate or the bus bracket and extends upward into the connecting through hole.

[0014] Based on the same inventive concept, the second aspect of the present application also provides a battery pack, comprising the battery module as described in the first aspect.

[0015] From the above, it can be seen that the battery module and battery pack provided in the present application can cover and protect the inner surface of the connecting through-hole by the protrusion extending into the connecting through-hole, thereby reducing the possibility of contact between the columnar fastener and the inner surface of the connecting through-hole, and correspondingly can reduce the debris or particles scraped from the output pole piece, and reduce the accumulation of the debris or particles on the surface of the output pole piece and the inside of the connecting through-hole, which helps to reduce the risk of short circuit in the battery module and ensure the electrical safety of the battery module.

[0016] At the same time, the protrusion and the fastener body are fixedly connected to form a whole. After the protrusion is inserted into the connecting through hole, the fastener body and the connecting through hole can be positioned and aligned, which helps to reduce the difficulty of assembly, simplify the assembly steps, and reduce the assembly cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic top view of a battery module according to an embodiment of the present application;

[0019] Figure 2 A three-dimensional schematic diagram of a battery module according to an embodiment of the present application;

[0020] Figure 3 A partial cross-sectional schematic diagram of a battery module according to an embodiment of the present application;

[0021] Figure 4 for Figure 2 An enlarged schematic diagram of part A in FIG.

[0022] Figure 5 A schematic diagram of the connection between the battery module and the connecting copper busbar according to an embodiment of the present application;

[0023] Figure 6 An exploded schematic diagram of the connection between the battery module and the connecting copper busbar according to an embodiment of the present application;

[0024] Figure 7 It is a three-dimensional schematic diagram of a first fastener in a battery module according to an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 1. Output pole piece; 101. Connecting through hole; 102. First part; 103. Second part;

[0027] 2. End plate;

[0028] 3. First fastener; 301. Fastener body; 3011. Fastening hole; 302. Protrusion; 3021. Inner hole;

[0029] 4. Second fastener;

[0030] 5. Connect copper busbar; 501. Copper busbar connection hole;

[0031] 6. Bus bracket. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0033] It should be noted that the relative arrangement of the components, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

[0034] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0036] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] In the related art, when bolts are installed on the output pole piece, scratches may occur between the two. For example, when the through hole diameter of the output pole piece is made smaller in order to meet the connection impedance requirement, the bolts inserted into the through hole are likely to scratch the inner surface of the through hole due to the small distance between the bolts and the inner surface of the through hole (or the hole wall). For another example, when the output pole piece adopts a thicker structure, the bolts have a longer travel through the through hole, and are also likely to scratch the inner surface of the through hole during the process of passing through the through hole.

[0038] Taking the output pole piece made of copper as an example, since the material hardness of the bolt is greater than that of copper, when the bolt and the output pole piece are scratched, the output pole piece will produce copper metal debris and particles. These debris and particles accumulate inside the through hole or on the surface of the output pole piece, causing the battery module to be at risk of short circuit.

[0039] In order to solve the above problems, an embodiment of the present application provides a battery module.

[0040] Figure 1 is a schematic diagram of a battery module, such as Figure 1 The battery module includes an output electrode piece 1.

[0041] Exemplarily, two output pole pieces 1 may be provided, serving as a high-voltage output positive pole and a high-voltage output negative pole of the battery module respectively, and the two output pole pieces 1 extend from two ends of the battery module respectively and are partially exposed.

[0042] Figure 2 is a three-dimensional schematic diagram of a battery module, such as Figure 2 The output electrode piece 1 is provided with a first direction (such as Figure 2The output pole piece 1 may be a copper bar, and the first direction is the thickness direction of the output pole piece 1, and the connecting through hole 101 passes through the upper surface and the lower surface of the output pole piece 1.

[0043] Figure 3 It is a partial cross-sectional schematic diagram of the battery module, such as Figure 3 The battery module also includes a first fastener 3, which includes a fastener body 301 and a protrusion 302 fixedly connected to the fastener body 301, and the fastener body 301 is arranged on one side of the output pole piece 1 along the first direction.

[0044] Figure 4 for Figure 2 The enlarged schematic diagram of part A in FIG. Figure 4 At least part of the protrusion 302 extends into the connecting through hole 101, and the protrusion 302 is used to cover the inner surface of the connecting through hole 101; an inner hole 3021 is formed in the protrusion 302 and penetrates to the fastener body 301 along the first direction.

[0045] Exemplarily, the protrusion 302 may be coaxially disposed with the connecting through hole 101 .

[0046] Exemplarily, along the first direction, the length of the portion of the protrusion 302 extending into the connecting through hole 101 is the same as the length of the connecting through hole 101 , or the length of the portion of the protrusion 302 extending into the connecting through hole 101 is less than the length of the connecting through hole 101 .

[0047] Exemplarily, the fastener body 301 may be a nut, a threaded sleeve, or a snap-fit ​​sleeve.

[0048] For example, the protrusion 302 and the fastener body 301 may be fixed by welding, or the two may be constructed as an integrally formed part.

[0049] In this embodiment, when a columnar fastener (e.g., a bolt or a clamping column) passes through the connecting through hole 101, since at least part of the inner surface of the connecting through hole 101 is covered by the protrusion 302, the columnar fastener can only pass through the inner hole 3021 of the protrusion 302. At this time, the columnar fastener may only scrape against the hole wall of the inner hole 3021 and will not come into contact with the inner surface of the connecting through hole 101. After passing through the inner hole 3021, the columnar fastener can be connected and fixed to the fastener body 301.

[0050] The battery module of the embodiment of the present application can cover and protect the inner surface of the connecting through hole 101 by the protrusion 302 extending into the connecting through hole 101, reducing the possibility of contact between the columnar fastener and the inner surface of the connecting through hole 101, and correspondingly reducing the debris or particles scraped from the output pole piece 1, and reducing the accumulation of the debris or particles on the surface of the output pole piece 1 and the inside of the connecting through hole 101, which helps to reduce the risk of short circuit in the battery module and ensure the electrical safety of the battery module. At the same time, the protrusion 302 and the fastener body 301 are fixedly connected to form a whole. After the protrusion 302 is inserted into the connecting through hole 101, the fastener body 301 and the connecting through hole 101 can be positioned and aligned, which helps to reduce the difficulty of assembly, simplify the assembly steps, and reduce the assembly cost.

[0051] In some embodiments, the hardness of the protrusion 302 is greater than the hardness of the output pole piece 1.

[0052] Since the hardness of the protrusion 302 is greater than the hardness of the output pole piece 1, even if the columnar fastener passing through the inner hole 3021 scrapes against the hole wall of the inner hole 3021, it is not easy for the protrusion 302 with greater hardness to produce debris or particles, further ensuring the electrical safety of the battery module.

[0053] In some embodiments, the protrusion 302 is configured as a steel structure.

[0054] The columnar fasteners are mostly made of steel. When the material of the protrusion 302 is also steel, the hardness of the protrusion 302 and the columnar fastener can be made approximately the same, ensuring that metal debris or particles are not easily generated when the two are scratched. At the same time, since the material cost of steel is relatively low, choosing steel to prepare the protrusion 302 also helps control the manufacturing cost of the battery module.

[0055] In some embodiments, the fastener body 301 and the protrusion 302 are constructed as an integrally formed piece.

[0056] The material of the protrusion 302 and the fastener body 301 can be the same, so the two can be formed into an integral part by casting or forging. Compared with forming the two separately and then welding them, forming the two into an integral part helps reduce production costs and material management costs.

[0057] In some embodiments, the protrusion 302 is embedded in the connecting through hole 101 .

[0058] Exemplarily, the protrusion 302 may be connected to the connecting through hole 101 by interference fit.

[0059] When the protrusion 302 is embedded in the connecting through hole 101, the first fastener 3 and the output pole piece 1 can form an integral structure, which can simplify the assembly steps of the battery module and help reduce the assembly cost.

[0060] In some embodiments, the protrusion 302 is loosely matched with the connecting through hole 101 .

[0061] When the protrusion 302 is clearance-matched with the connecting through hole 101 , the requirement for the outer diameter dimensional accuracy of the protrusion 302 is relatively low, which helps to reduce the overall preparation cost of the first fastener 3 .

[0062] like Figure 3 In some embodiments, a fastener body 301 has a fastening hole 3011 therein, and the fastening hole 3011 is connected to the inner hole 3021 .

[0063] Exemplarily, the fastening hole 3011 may be a threaded hole or a snap-on hole.

[0064] Illustratively, the fastening hole 3011 may be coaxially arranged with the inner hole 3021 .

[0065] For example, the diameter of the inner hole 3021 may be greater than the diameter of the fastening hole 3011 , so that the columnar fastener can be connected to the fastener body 301 after passing through the protruding portion 302 .

[0066] The inner hole 3021 can guide the columnar fastener inserted into the inner hole 3021 , so that the columnar fastener can be more easily aligned with the fastening hole 3011 after passing through the inner hole 3021 , thereby facilitating the connection between the columnar fastener and the fastener body 301 .

[0067] The copper busbar 5 is used as an electrical connector connected to the output pole piece 1 for further description. Figure 5 is a schematic diagram of a battery module connected with a connecting copper bar 5, such as Figure 5 The battery module also includes a second fastener 4, which can generate an extrusion force on the connecting copper bar 5 to make the connecting copper bar 5 abut against the output pole piece 1 to achieve electrical connection between the two.

[0068] Figure 6 FIG. 1 is an exploded schematic diagram of a battery module connected with a connecting copper bar 5, as shown in FIG. Figure 6 The second fastener 4 is passed through the inner hole 3021 and connected to the fastener body 301 .

[0069] The second fastener 4 may include a columnar structure, and the columnar structure is provided with a connecting structure (such as a thread or a clamping joint) matching the fastening hole 3011 in the fastener body 301 at least at the end, and the connecting structure passes through the inner hole 3021 of the protrusion 302 and is connected to the fastener body 301 through the fastening hole 3011.

[0070] like Figure 6 During assembly, the copper bar 5 is placed above the output pole piece 1, and the copper bar connection hole 501 of the copper bar 5 is aligned with the corresponding connection through hole 101 of the output pole piece 1. The fastener body 301 is arranged below the output pole piece 1, and the second fastener 4 passes through the copper bar connection hole 501 and the inner hole 3021 of the protrusion 302 in the corresponding connection through hole 101 from above the copper bar 5, and then is connected to the fastener body 301 through the fastening hole 3011.

[0071] Exemplarily, along the first direction, when the length of the protrusion 302 is greater than the length of the connecting through hole 101, the protrusion 302 can extend into the copper busbar connecting hole 501. However, it should be noted that, under normal circumstances, the length of the protrusion 302 along the first direction is not greater than the sum of the thicknesses of the output pole piece 1 and the connecting copper busbar 5. In other words, after the lower surface of the connecting copper busbar 5 abuts against the upper surface of the output pole piece 1, the protrusion 302 will not extend out of the upper surface of the connecting copper busbar 5, so as to avoid the protrusion 302 hindering the second fastener 4 from pressing down the connecting copper busbar 5 when the second fastener 4 is installed, thereby failing to ensure reliable connection between the connecting copper busbar 5 and the output pole piece 1.

[0072] Figure 7 is a three-dimensional schematic diagram of the first fastener 3. In some embodiments, the fastener body 301 is a nut, and the protrusion 302 is configured as a sleeve structure, such as Figure 7 Correspondingly, the second fastener 4 is a bolt that matches the nut.

[0073] Nuts and bolts are commonly used fasteners, which have the advantages of simple connection, strong connection reliability, and low cost. At the same time, usually, nuts and bolts are made of steel.

[0074] like Figure 6 In some embodiments, the battery module further includes an end plate 2 and a busbar support 6. The top of the end plate 2 and / or the top of the busbar support 6 is partially located below the output pole piece 1.

[0075] like Figure 6 The output pole piece 1 includes a first part 102 arranged inside the battery module, and an exposed second part 103, and a connecting through hole 101 is arranged in the second part 103; the fastener body 301 is embedded in the end plate 2 or the bus bracket 6, and the protrusion 302 extends out of the upper surface of the end plate 2 or the bus bracket 6 and extends upward into the connecting through hole 101.

[0076] Exemplarily, the output electrode piece 1 is a strip structure, and the first portion 102 and the second portion 103 are connected along the length direction of the strip structure (eg Figure 6 distribution in the X direction.

[0077] Illustratively, along the thickness direction of the output pole piece 1, when the end plate 2 is directly below the connecting through hole 101, the fastener body 301 is embedded in the end plate 2, and the protrusion 302 extends out of the upper surface of the end plate 2; when the bus bracket 6 is directly below the connecting through hole 101, the fastener body 301 is embedded in the bus bracket 6, and the protrusion 302 extends out of the upper surface of the bus bracket 6.

[0078] Exemplarily, the first portion 102 of the output pole piece 1 is electrically connected to the battery cell inside the battery module; or the multiple battery cells inside the battery module are connected to the bus bar, and the first portion 102 of the output pole piece 1 is electrically connected to the bus bar. The second portion 103 of the output pole piece 1 is exposed to facilitate contact connection with the connecting copper bus 5.

[0079] After the fastener body 301 of the first fastener 3 is embedded in the end plate 2 or the busbar bracket 6, it is relatively fixed to the end plate 2 or the busbar bracket 6, which is convenient for connecting the second fastener 4 with the fastener body 301. At the same time, when installing the second fastener 4, the end plate 2 or the busbar bracket 6 can also support the output pole piece 1 and the connecting copper bar 5 at the bottom, which is convenient for connecting and fixing the second fastener 4 and the first fastener 3, and helps to ensure the connection reliability between the connecting copper bar 5 and the output pole piece 1.

[0080] It should also be noted that if Figure 3 , taking the fastener body 301 embedded in the bus bracket 6 as an example, along the first direction, the upper surface of the fastener body 301 is flush with the upper surface of the bus bracket 6, or lower than the upper surface of the bus bracket 6, which can ensure that the output pole piece 1 is supported by the bus bracket 6, and can avoid the fastener body 301 protruding from the bus bracket 6 to cause local extrusion of the lower surface of the output pole piece 1, thereby causing local deformation of the output pole piece 1.

[0081] At the same time, the outer diameter of the protrusion 302 can be the same as the inner diameter of the connecting through hole 101. The position between the output pole piece 1 and the bus bracket 6 can be relatively fixed by fitting the protrusion 302 and the connecting through hole 101 to avoid collision between the protrusion 302 and the inner surface of the connecting through hole 101 during assembly.

[0082] Based on the same inventive concept and in combination with the description of the battery modules of the above embodiments, this embodiment provides a battery pack having the corresponding technical effects of the battery modules of the above embodiments, which will not be described in detail herein.

[0083] A battery pack includes the battery modules according to the above embodiments.

[0084] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0085] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0086] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0087] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0088] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0089] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A battery module, characterized in that: include: The output pole piece is provided with a connecting through hole penetrating along a first direction; The first fastener includes a fastener body and a protrusion fixedly connected to the fastener body; the fastener body is arranged on one side of the output pole piece along the first direction, at least part of the protrusion extends into the connecting through hole, and the protrusion is used to cover the inner surface of the connecting through hole; an inner hole is opened in the protrusion and passes through the fastener body along the first direction.

2. The battery module according to claim 1, characterized in that: The hardness of the protrusion is greater than the hardness of the output pole piece.

3. The battery module according to claim 2, characterized in that: The protrusion is configured as a steel structure.

4. The battery module according to claim 1, characterized in that: The fastener body and the protrusion are constructed as an integrally formed part.

5. The battery module according to claim 1, characterized in that: The protrusion is embedded in the connecting through hole.

6. The battery module according to claim 1, characterized in that: The protrusion is loosely matched with the connecting through hole.

7. The battery module according to claim 1, characterized in that: The fastener body has a fastening hole therein, and the fastening hole is communicated with the inner hole.

8. The battery module according to claim 1, characterized in that: The fastener body is a nut, and the protrusion is a sleeve structure.

9. The battery module according to claim 1, characterized in that: The battery module also includes: End plates and busbar supports; Wherein, the fastener body is embedded in the end plate or the busbar bracket, and the protrusion extends out of the upper surface of the end plate or the busbar bracket and extends upward into the connecting through hole.

10. A battery pack, characterized in that: Comprising the battery module according to any one of claims 1 to 9.

Images