Battery pack end plate assembly and battery pack

Abstract

The utility model provides a battery pack end plate assembly and a battery pack, relates to the technical field of batteries, and is used for conveniently putting battery cells into a box and avoiding insufficient rigidity of the battery pack. The battery pack end plate assembly comprises an end plate main body, the end plate main body is provided with a first side surface and a second side surface, the first side surface is used for mounting a battery cell group, and the second side surface is provided with a convex part. The lug boss is provided with a crimping surface; and the crimping surface is used for connecting a battery pack box body of the battery pack. The crimping surface is provided with a first groove, and the first groove extends to the second side surface. According to the battery pack end plate assembly and the battery pack provided by the invention, the crimping surface is adhered to the connecting part of the battery pack box body, and the adhesive is extruded to the second side surface through the first groove by virtue of the crimping surface, so that the second side surface can be adhered to the other side surface of the connecting part, and the problem that the end plate and the cross beam part of the battery pack box body are difficult to clamp is avoided; the rigidity of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack endplate assembly and a battery pack. Background Technology

[0002] There are various assembly methods for battery packs, among which the CTP (Cell-to-Pack) battery pack is a solution developed to meet the requirements of lightweight design. The battery pack directly integrates the cells into the battery pack housing, skipping the traditional standardized module stage.

[0003] When the battery cells are installed in the battery pack, each cell is mounted on an end plate, and the fins on the end plate are secured to the crossbeams of the battery pack housing to facilitate installation. To avoid installation difficulties, a clearance fit is usually used between the fins and the crossbeams. However, a clearance fit can prevent the end plate and the crossbeams from being properly secured, resulting in insufficient rigidity of the battery pack. Utility Model Content

[0004] This application provides a battery pack end plate assembly and a battery pack, which facilitates cell insertion into the battery pack and avoids insufficient battery pack rigidity.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] One aspect of this application provides a battery pack end plate assembly, which includes an end plate body. The end plate body has a first side and a second side. The first side is used to mount a battery cell assembly, and the second side has a protrusion.

[0007] The protrusion has a pressing surface, which is used to connect to the battery pack housing of the battery pack;

[0008] The pressing surface has a first groove, which extends to the second side surface.

[0009] In one possible implementation, the second side has a second groove that communicates with the first groove.

[0010] In one possible implementation, a seal strip is provided on the outer periphery of the second side, and the seal strip surrounds and forms the second groove.

[0011] In one possible implementation, the sidewall of the first groove has the same thickness as the adhesive strip.

[0012] In one possible implementation, the first groove extends below the second side.

[0013] In one possible implementation, the two ends of the protrusion are flush with the two ends of the end plate body.

[0014] In one possible implementation, the end plate body and the protrusion are integrally formed.

[0015] In one possible implementation, the first side has adhesive for bonding the battery cell assembly.

[0016] Another aspect of this application provides a battery pack, which includes a battery pack housing and a battery pack end plate assembly of any of the above-mentioned cell groups;

[0017] The cell assembly is connected to a first side of the battery pack endplate assembly;

[0018] The battery pack housing has a connecting part, the connecting part has a beam, and the beam has a first plane and a second plane;

[0019] Structural adhesive is coated on the first plane, and the pressing surface of the battery pack end plate assembly is pressed onto the structural adhesive so that the structural adhesive flows through the first groove in the battery pack end plate assembly to the second side surface;

[0020] The second side is bonded to the second plane by the structural adhesive.

[0021] In one possible implementation, the battery pack further includes a liquid cooling plate bonded to the bottom of the cell assembly.

[0022] The battery pack endplate assembly and battery pack provided in this application have the following beneficial effects:

[0023] The battery pack endplate assembly includes an endplate body with a first side and a second side. The first side is used to mount battery cell assemblies, allowing multiple battery cells to be mounted on the first side of the endplate body. The second side has a protrusion with a pressing surface and a first groove extending onto the second side. The pressing surface is used to bond with a connecting part in the battery pack housing. An adhesive is present between the pressing surface and the connecting part. When the pressing surface is pressed onto the connecting part, the adhesive flows along the first groove onto the second side of the endplate body under the pressure of the pressing force, facilitating bonding between the second side and the other side of the connecting part.

[0024] Compared with related technologies, the battery pack end plate assembly and battery pack provided in this application have a pressing surface with a first groove on the protrusion. The pressing surface is used to bond with the connecting part of the battery pack housing, and the adhesive is squeezed through the first groove onto the second side surface through the pressing surface, so that the second side surface can bond with the other side of the connecting part. This improves the connection strength between the battery pack end plate assembly and the battery pack housing, avoids the difficulty in clamping the end plate to the crossbeam of the battery pack housing, and improves the rigidity of the battery pack. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the battery pack end plate assembly provided in the embodiments of this application;

[0027] Figure 2 This is a schematic diagram showing the connection between the battery pack end plate assembly and the battery pack housing provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10 - End plate main body;

[0030] 11-First side surface; 12-Second side surface; 121-Second groove; 122-Glue-blocking strip;

[0031] 20 - Protrusion;

[0032] 21-Crimping surface; 211-First groove; 212-Groove;

[0033] 30 - Battery pack casing;

[0034] 31-Connecting part; 311-First plane; 312-Second plane.

[0035] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0036] When installing battery cells into the battery pack, the end plate and crossbeam cannot be properly secured, resulting in insufficient battery pack rigidity. This problem arises because, to facilitate the installation of the end plate with the battery cells, a clearance fit is required between the end plate and crossbeam. However, due to this clearance, the end plate and crossbeam cannot be properly secured, causing the battery cells and end plates to easily wobble within the battery pack enclosure, resulting in insufficient overall battery pack rigidity.

[0037] To address the aforementioned technical problems, this application provides a battery pack end plate assembly and a battery pack. By providing a pressing surface with a first groove on the protrusion, the pressing surface is bonded to the connecting part of the battery pack housing. The adhesive is then squeezed through the first groove onto the second side surface via the pressing surface, allowing the second side surface to bond with the other side of the connecting part. This improves the connection strength between the battery pack end plate assembly and the battery pack housing, avoids difficulties in clamping the end plate to the crossbeam of the battery pack housing, and enhances the rigidity of the battery pack.

[0038] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application 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 application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0039] This application provides a battery pack end plate assembly, which is a structure that protects the battery cells in the battery pack. In a CTP battery pack, the battery pack end plate assembly also serves to fix and support the battery cells.

[0040] like Figure 1 As shown, the battery pack end plate assembly includes an end plate body 10 and a protrusion 20. The end plate body 10 is the main structure of the end plate assembly. The end plate body 10 can be rectangular, approximately rectangular, circular, or approximately circular, etc., and this application does not limit this. The protrusion 20 is a protrusion provided on the end plate body 10. The protrusion 20 is an auxiliary pressing platform in the battery pack end plate assembly. The protrusion 20 and the end plate body 10 can be integrally formed. The protrusion 20 can also be installed on the end plate body 10 by snap-fit, welding, threaded connection, etc.

[0041] refer to Figure 2 The end plate body 10 has a first side surface 11 and a second side surface 12, which can be two opposite end surfaces of the end plate body 10. Figure 2 As shown in the example, the first side 11 and the second side 12 are the two sides with larger planar areas among the end faces of the end plate body 10.

[0042] The first side 11 is used to mount the cell assembly, for example, the large surface of the cell in the cell assembly is bonded to the first side 11. The cell assembly includes at least one cell, and the specific number of cells can be adjusted according to the power requirements of the battery pack, which is not limited in this application.

[0043] refer to Figure 1 and Figure 2The second side 12 has a protrusion 20, which can be integrally formed with the end plate body 10 to ensure the connection strength between the protrusion 20 and the end plate body 10. The protrusion 20 has a pressing surface 21. (Reference) Figure 1 and Figure 2 The pressing surface 21 can be the end face of the protrusion 20 adjacent to the second side surface 12. The pressing surface 21 is used to bond to the connecting portion 31 of the battery pack housing 30, for example, to the top of the connecting portion 31. An adhesive is present between the pressing surface 21 and the connecting portion 31, and the adhesive can be a structural adhesive or other glue.

[0044] refer to Figure 1 and Figure 2 The pressing surface 21 has a first groove 211, which can be rectangular, approximately rectangular, circular, or approximately circular. In this embodiment, the first groove 211 is rectangular to match the elongated connecting portion 31. (See reference...) Figure 2 When the protrusion 20 is connected to the connecting part 31, adhesive can be placed in the first groove 211 in the protrusion 20 or adhesive can be applied to the top of the connecting part 31. Then, the bottom of the first groove 211 is pressed onto the connecting part 31 so that the protrusion 20 is bonded to the connecting part.

[0045] The first groove 211 extends to the second side surface 12. When the first groove 211 is pressed against the top of the connecting part 31, the adhesive between the first groove 211 and the connecting part 31 flows into the second side surface 12 along the first groove 211 under the action of the pressing force, so that there is adhesive on the second side surface 12. The second side surface 12 can be bonded to the side of the connecting part 31, which increases the connection strength between the battery pack end plate assembly and the battery pack housing 30, thereby improving the overall rigidity of the battery pack.

[0046] The battery pack end plate assembly provided in this application embodiment has a pressing surface 21 with a first groove 211 on the protrusion 20. The pressing surface 21 is bonded to the connecting part 31 of the battery pack housing 30. The adhesive is also pressed onto the second side 12 through the first groove 211 via the pressing surface 21, so that the second side 12 can be bonded to the other side of the connecting part 31. This improves the connection strength between the battery pack end plate assembly and the battery pack housing 30, avoids the end plate being difficult to clamp to the crossbeam of the battery pack housing, and improves the rigidity of the battery pack.

[0047] In some embodiments, reference Figure 2The second side surface 12 has a second groove 121, which can be located on the portion of the second side surface 12 facing the pressing surface 21. The second groove 121 communicates with the first groove 211, and the first groove 211 and the second groove 121 can be indirectly communicated through a communication channel, or the first groove 211 and the second groove 121 can be directly communicated; this application does not impose any limitations on this. This arrangement allows the adhesive flowing from the first groove 211 onto the second side surface 12 to be stored within the second groove 121, preventing the adhesive from overflowing from the second side surface 12.

[0048] Based on the above embodiment, a baffle strip 122 is provided on the outer periphery of the second side 12, and the baffle strip 122 surrounds and forms the second groove 121. The baffle strip 122 can be a long strip of rubber connected end to end. For example, the baffle strip 122 is glued to the second side 12, so that the inner periphery of the baffle strip 122 forms the inner circumferential surface of the second groove 121, and the part of the second side 12 surrounded by the baffle strip forms the bottom of the second groove 121. In this embodiment, the baffle strip 122 prevents the adhesive on the second side 12 from overflowing, which facilitates the formation of the second groove 121. Moreover, the rubber baffle strip 122 has good vibration damping performance, which can prevent the battery cell assembly from being damaged by shaking.

[0049] In some embodiments, the thickness of the sidewall of the first groove 211 is the same as the thickness of the adhesive strip 122. (See reference...) Figure 1 The sidewall thickness of the first groove 211 is the same as the thickness of the outer peripheral sidewall of the first groove 211. For example, the sidewall of the first groove 211 can refer to the second groove 121 described above, and be formed by a rubber strip of the same thickness as the rubber strip 122, so as to facilitate the formation of the first groove 211 and the second groove 121.

[0050] In some embodiments, reference Figure 2 The first groove 211 extends below the second side 12, or in other words, the first groove 211 has a groove 212 at the connection with the second groove 121. The bottom of the groove 212 is located below the second side 12. The groove 212 is used to store the adhesive squeezed out from between the first groove 211 and the connecting part 31, so that the squeezed adhesive has a buffer process in the process of flowing to the second side 12, and avoids the adhesive being spread unevenly on the second side 12.

[0051] In some embodiments, reference Figure 2The two ends of the protrusion 20 are flush with the two ends of the end plate body 10. Alternatively, the protrusion 20 extends from one end of the end plate body 10 to the other along its length. This arrangement maximizes the contact area between the protrusion 20 and the connecting portion 31 when the protrusion 20 presses against the connecting portion 31 of the battery pack housing 30, increasing the bonding area between the battery pack end plate assembly and the connecting portion, thereby increasing the connection strength and further enhancing the overall rigidity of the battery pack.

[0052] In some embodiments, the end plate body 10 and the protrusion 20 are integrally formed. By integrally forming the protrusion 20 with the end plate body 10, the connection strength between the protrusion 20 and the end plate body 10 is ensured.

[0053] In some embodiments, the first side 11 has adhesive for bonding the cell assembly. For example, the large faces of each cell in the cell assembly are bonded to the first side by adhesive to enable the end plate assembly to mount the cell assembly.

[0054] This application also provides a battery pack, which includes a battery pack housing 30, a battery cell assembly, and a battery pack end plate assembly. The specific structure and related effects of the battery pack end plate assembly can be found in the description of the above embodiments.

[0055] refer to Figure 2 The cell assembly is connected to the first side 11 of the battery pack end plate assembly. The battery pack housing 30 has a connecting part 31, which has a beam. The beam can be a crossbeam formed in the inner cavity of the battery pack housing 30, and the beam has a first plane 311 and a second plane 312.

[0056] refer to Figure 2 The first plane 311 and the second plane 312 can be the top surface and the side surface of the connecting portion 31, respectively. Structural adhesive is coated on the first plane 311, and the pressing surface 21 is pressed onto the structural adhesive so that the structural adhesive flows through the first groove 211 in the battery pack end plate assembly to the second side surface 12. The second side surface 12 is bonded to the second plane 312 by the structural adhesive.

[0057] The battery pack provided in this application embodiment is bonded to the first plane 311 of the connecting part 31 of the battery pack housing 30 through the pressing surface 21, and the adhesive is squeezed onto the second side surface 12 through the first groove 211 through the pressing surface 21, so that the second side surface 12 can be bonded to the second plane 312 of the connecting part 31, thereby improving the connection strength between the battery pack end plate assembly and the battery pack housing 30, avoiding the difficulty in clamping the end plate to the crossbeam of the battery pack housing, and improving the rigidity of the battery pack.

[0058] Furthermore, since the battery pack provided in this application adopts all the technical solutions of any of the above embodiments, it has at least all the beneficial effects brought about by any of the above embodiments, which will not be described in detail here.

[0059] In some embodiments, the battery pack further includes a liquid cooling plate bonded to the bottom of the cell assembly. This configuration allows for temperature management of the cell assembly via the liquid cooling plate, such as cooling or maintaining the temperature of the cells. Furthermore, the liquid cooling plate can be connected to the battery pack housing to restrict the movement of the cell assembly and improve the overall rigidity of the battery pack.

[0060] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0061] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0062] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0064] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack end plate assembly, characterized in that, Includes an end plate body (10), the end plate body (10) having a first side (11) and a second side (12), the first side (11) being used to mount the battery cell assembly, and the second side (12) having a protrusion (20). The protrusion (20) has a pressing surface (21) for bonding with the connecting part (31) of the battery pack housing (30); The pressing surface (21) has a first groove (211) that extends to the second side surface (12).

2. The battery pack end plate assembly according to claim 1, characterized in that, The second side (12) has a second groove (121) that communicates with the first groove (211).

3. The battery pack end plate assembly according to claim 2, characterized in that, A rubber-blocking strip (122) is provided on the outer periphery of the second side (12), and the rubber-blocking strip (122) surrounds and forms the second groove (121).

4. The battery pack end plate assembly according to claim 3, characterized in that, The sidewall of the first groove (211) has the same thickness as the rubber strip (122).

5. The battery pack endplate assembly according to any one of claims 1-4, characterized in that, The first groove (211) extends below the second side (12).

6. The battery pack end plate assembly according to any one of claims 1-4, characterized in that, The two ends of the protrusion (20) are flush with the two ends of the end plate body (10).

7. The battery pack end plate assembly according to any one of claims 1-4, characterized in that, The end plate body (10) and the protrusion (20) are integrally formed.

8. The battery pack end plate assembly according to any one of claims 1-4, characterized in that, The first side (11) has adhesive for bonding the battery cell assembly.

9. A battery pack, characterized in that, Includes a battery pack housing (30), a cell assembly, and a battery pack endplate assembly as described in any one of claims 1-8; The cell assembly is connected to the first side (11) of the battery pack end plate assembly; The battery pack housing (30) has a connecting part (31), the connecting part (31) has a beam, the beam has a first plane (311) and a second plane (312). Structural adhesive is coated on the first plane (311), and the pressing surface (21) of the battery pack end plate assembly is pressed onto the structural adhesive so that the structural adhesive flows through the first groove (211) in the battery pack end plate assembly to the second side surface (12). The second side (12) is bonded to the second plane (312) by the structural adhesive.

10. The battery pack according to claim 9, characterized in that, The battery pack also includes a liquid cooling plate, which is bonded to the bottom of the cell assembly.

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