A battery pack

Abstract

The application discloses a battery pack, comprising: a battery box; a battery module arranged in the battery compartment, the battery module comprising a plurality of single batteries electrically connected through busbars, an area where the busbars of the battery module are located being a busbar area, one end of the single battery facing the busbar being provided with a pressure relief part, and an area where the pressure relief part of the battery module is located being a pressure relief area; a collection assembly comprising a collection main body and a buffer body arranged between the battery module and the collection main body, the buffer body being arranged between adjacent busbar areas and pressure relief areas; and a buffer layer filled between the battery module and the battery box cover and located in the busbar area. The buffer body of the application can serve as the boundary of the buffer layer, and when foaming glue is injected into the busbar area, the buffer body can block the foaming glue from flowing into the pressure relief area, so that the foaming glue can only foam to form the buffer layer in the busbar area, thereby saving the material cost of the glue blocking strip required to be arranged at the corresponding position.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack. Background Technology

[0002] A battery pack typically consists of a battery housing and a battery module. The battery housing usually includes a battery compartment and an electrical compartment, with the battery module housed within the battery compartment. The battery module comprises multiple individual cells, which can be connected in series or parallel via busbars.

[0003] Vibrations and impacts during vehicle operation are transmitted to the battery pack. To improve the stability of the individual cells within the battery pack, expanding foam is typically used to fill the battery casing. Generally, the expanding foam is placed between the individual cells and the battery casing cover, and the busbars connecting the individual cells are also secured with expanding foam.

[0004] After curing, the expanding foam possesses considerable strength and toughness, enabling it to firmly bond individual battery cells and busbars together to form a unified whole. The elasticity of the expanding foam can absorb and buffer mechanical stress, preventing the busbars from fatigue-induced fracture due to long-term vibration, and also preventing friction between battery cells, thereby improving the mechanical stability and reliability of the entire battery pack.

[0005] When a single battery cell has a pressure relief section on the side facing the battery pack cover, in addition to the terminal post connecting to the busbar, the expanding foam needs to avoid blocking the pressure relief section and preventing proper pressure relief. Currently, the common practice is to install a sealant strip on the side of the battery pack facing the battery pack cover to separate the area requiring expanding foam from the area that needs to be avoided. Because the area for expanding foam needs to be enclosed by the sealant strip, a large amount of sealant strip is used, resulting in higher costs.

[0006] Therefore, how to reduce the amount of rubber strips used and lower costs is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] In view of this, the purpose of this application is to provide a battery pack that reduces the amount of rubber strips used and lowers costs.

[0008] To achieve the above objectives, this application provides the following technical solution:

[0009] The first aspect of this application provides a battery pack, comprising:

[0010] A battery enclosure includes a enclosure body and a battery cover disposed on the opening side of the enclosure body, wherein the enclosure body includes a battery compartment;

[0011] A battery module is disposed in the battery compartment. The battery module includes multiple individual batteries that are electrically connected by a busbar. The area where the busbar of the battery module is located is the busbar area. The end of each individual battery facing the busbar is provided with a pressure relief part. The area where the pressure relief part of the battery module is located is the pressure relief area.

[0012] The acquisition component includes an acquisition body and a buffer body disposed between the battery module and the acquisition body. The acquisition body is used to acquire the voltage and / or temperature of the battery module, and the buffer body is arranged between the adjacent busbar area and the pressure relief area.

[0013] A buffer layer is filled between the battery module and the battery box cover, and is located in the busbar area.

[0014] The battery pack provided in this application, by setting the position of the acquisition component, arranges the buffer body of the acquisition component between the adjacent busbar area and the pressure relief area, thereby separating the busbar area that needs to be filled with a buffer layer and the pressure relief area that needs to be isolated from the buffer layer. This buffer body can serve as the boundary of the buffer layer; when the material of the buffer layer (such as expanding foam) is injected into the busbar area, the buffer body can prevent the material of the buffer layer from flowing into the pressure relief area, so that the material of the buffer layer can only foam and form the buffer layer in the busbar area.

[0015] This application utilizes the buffer body of the acquisition component as a sealant, saving material costs associated with installing sealant strips at corresponding locations. This application not only saves space on the sealant strip itself but also eliminates the need for pre-allocated operating space and tolerance clearances for its installation, allowing for a more compact internal battery pack layout and contributing to increased energy density. Since no additional sealant strip is required, errors such as missed sealant strips, misaligned strips, or weak adhesion are fundamentally eliminated. The sealant function is automatically activated once the acquisition component is correctly installed, improving the first-pass yield and overall product quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an exploded view of the battery pack disclosed in the embodiments of this application;

[0018] Figure 2 This is a schematic diagram of the battery pack disclosed in this application with the battery box cover and part of the battery pack removed.

[0019] Figure 3 This is a top view of the battery pack disclosed in the embodiments of this application after the battery box cover has been removed;

[0020] Figure 4 This is a top view of the battery pack disclosed in the embodiments of this application after removing the battery box cover and the second buffer body;

[0021] Figure 5 This is a schematic diagram of the structure of the adhesive-blocking strip, the collection component, and the adhesive-blocking diaphragm disclosed in the embodiments of this application;

[0022] Figure 6 This is a top view of the adhesive barrier strip, the collection component, and the adhesive barrier diaphragm disclosed in the embodiments of this application;

[0023] Figure 7 for Figure 6 Sectional view along AA;

[0024] Figure 8 for Figure 7 A magnified view of part A in the image;

[0025] Figure 9 This is a partial enlarged view of the end of the first sealing strip disclosed in the embodiments of this application.

[0026] The meanings of the various reference numerals in the figure are as follows:

[0027] 100 - Battery enclosure; 110 - Enclosure body; 111 - Battery compartment; 120 - Battery cover;

[0028] 200 - Battery module; 210 - Individual battery cell;

[0029] 300-busbar;

[0030] 400 - Acquisition component; 410 - Acquisition body; 420 - Buffer; 421 - First buffer; 422 - Second buffer;

[0031] 500-Glue-blocking diaphragm;

[0032] 600 - First retaining strip; 601 - First groove; 602 - Second groove;

[0033] 700 - Second rubber strip;

[0034] 800-Buffer layer. Detailed Implementation

[0035] This application discloses a battery pack that reduces the amount of adhesive strips used and lowers costs.

[0036] 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 some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] like Figures 1-3 As shown in the figure, this application discloses a battery pack, which includes a battery housing 100, a battery module 200, a data acquisition component 400, and a buffer layer 800.

[0038] The battery housing 100 includes a housing body 110 and a battery cover 120 disposed on the opening side of the housing body 110. The housing body 110 includes a battery compartment 111. The battery module 200 is disposed in the battery compartment 111. After the battery cover 120 is fixed to the opening side of the housing body 110, the battery module 200 is sealed in the battery compartment 111.

[0039] The battery housing 100 is typically a closed or semi-closed structure made of materials such as metal and plastic. It is the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack in different usage scenarios.

[0040] The battery housing 100 provides installation space for the battery module 200, BMS (Battery Management System), cooling system, busbar 300, etc., and fixes these components inside the housing body 110 through reasonable structural design, ensuring that they maintain a relatively stable position during battery pack operation and avoiding damage to components or loosening of connections due to vibration, impact, or other factors.

[0041] The enclosure body 110 can be cast from materials such as steel plate and aluminum alloy, or it can be made of lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials. The shape of the enclosure body 110 can be cylindrical, cuboid, cube, etc.

[0042] The housing 110 includes a battery compartment 111, and may also include an electrical compartment (or may not have an electrical compartment). The core function of the battery compartment 111 is to provide installation space for the battery modules 200. The electrical compartment is where the various battery modules 200 within the battery compartment 111 are connected in series and parallel (when there are multiple battery modules 200). Through the connection arrangement of the busbar 300 within the electrical compartment, different battery modules 200 can be connected according to design requirements to form a circuit system that meets the vehicle's power needs, while also controlling and managing the battery charging and discharging process.

[0043] The battery compartment 111 and the electrical compartment can be separated by a first partition. When multiple battery modules 200 need to be installed, the battery compartment 111 can be separated into at least two independent and sealed sub-battery compartments by a second partition. The first and second partitions can be designed to be perpendicular, or they can be arranged at other angles. The first and second partitions can be glued to the inside of the housing body 110, or they can be welded to the inside of the housing body 110.

[0044] It should be noted that the number of second separators is not limited to one. Those skilled in the art will understand that the number of second separators can be designed based on the number of sub-battery compartments. One second separator can divide battery compartment 111 into two sub-batteries, while two parallel and spaced-apart second separators can divide battery compartment 111 into three sub-batteries. Of course, those skilled in the art can select the specific number of second separators according to design requirements. It should also be noted that it is possible to have only one battery compartment 111, i.e., without second separators separating battery compartment 111.

[0045] The battery module 200 includes multiple individual battery cells 210 electrically connected by busbars 300, which connect the individual battery cells 210 in series or parallel. Those skilled in the art will understand that each individual battery cell 210 includes a battery casing and a cell disposed within the battery casing. The battery casing typically has terminal assemblies, and the terminal assemblies of two individual battery cells 210 can be electrically connected via the busbars 300.

[0046] A terminal assembly typically includes a positive terminal assembly and a negative terminal assembly. When two individual cells 210 are connected in series, the busbar 300 needs to electrically connect the positive terminal assembly of one individual cell 210 and the negative terminal assembly of the other individual cell 210 respectively. When two individual cells 210 are connected in parallel, the busbar 300 needs to electrically connect the terminal assemblies of the same polarity of both individual cells 210 respectively. The battery cell has a positive tab and a negative tab. The positive tab is electrically connected to the positive terminal assembly of the battery casing, and the negative tab is electrically connected to the negative terminal assembly of the battery casing. The terminal assembly (positive and negative terminal assemblies) is an important component connecting the individual battery 210 to the external circuit. It can transfer the electrical energy generated by the battery cell to the external circuit, and simultaneously introduce electrical energy from the external circuit into the battery cell for charging, acting as a bridge for current conduction.

[0047] A pressure relief section is provided at the end of the individual battery cell 210 facing the battery case cover 120. It should be noted that the pressure relief section can be formed directly on one end face of the battery casing, or it can be connected to the corresponding end face of the battery casing. If the pressure relief section is connected to one end face of the battery casing, a pressure relief port needs to be provided on the corresponding end face of the battery casing, and the pressure relief section is connected to the pressure relief port to seal it. The connection method can be welding or other connection methods.

[0048] The pressure relief section may include a weak area, which is configured to open for pressure relief when the internal pressure of the battery casing is reached. A groove may be provided on the weak area; when the internal pressure of the battery casing is reached, the groove breaks, causing the weak area to open for pressure relief. When a single cell generates a large amount of gas due to abnormal conditions such as overcharging, overheating, or short circuits, causing the internal pressure to rise to a certain level, the pressure generated by the gas will cause the groove to break, resulting in the weak area detaching or bending from the battery casing, thus forming a pressure relief port on the battery casing to release the pressure inside the battery casing.

[0049] For ease of understanding, the area where the busbar 300 of the battery module 200 is located is defined as the busbar area, and the area where the pressure relief part of the battery module 200 is located is defined as the pressure relief area.

[0050] The data acquisition component 400 includes a data acquisition body and a buffer 420 disposed between the battery module 200 and the data acquisition body 410. The data acquisition body 410 is used to acquire the voltage and / or temperature of the battery module 200, and the buffer 420 is arranged between adjacent busbar and pressure relief areas. It should be noted that the data acquisition component 400 can be an FPC (Flexible Printed Circuit) component.

[0051] The battery module 200 typically detects voltage and temperature information through a data acquisition component 400. The data acquisition component 400 has a voltage acquisition unit and a temperature acquisition unit on its main body, and the main body is fixed to the battery module 200 via a buffer 420. The voltage acquisition unit can be connected to the busbar 300 to acquire the voltage value of a single battery cell 210; the temperature acquisition unit can be connected to the casing, cover, or other corresponding location of the single battery cell 210 to acquire its temperature value.

[0052] The buffer 420 can be a buffer foam or other materials with a buffering effect. This embodiment does not limit the material of the buffer 420.

[0053] The buffer layer 800 is filled between the battery module 200 and the battery box cover 120, and is located in the busbar area. Vibration and impact are inevitable during vehicle operation. The filling of the buffer layer 800 can firmly fix each individual battery cell 210 and the busbar 300, preventing them from rubbing against each other, shifting or loosening due to vibration, thereby avoiding problems such as short circuits and insulation failure caused by mechanical wear.

[0054] The buffer layer 800 is usually a foam layer. Foam itself is an excellent insulating material that can completely wrap the busbar 300, effectively preventing short circuit risks caused by condensation, dust accumulation or intrusion of external foreign objects, improving electrical safety, and also playing a certain role in moisture protection and corrosion prevention.

[0055] The battery pack disclosed in this application, by setting the position of the acquisition component 400, arranges the buffer body 420 of the acquisition component 400 between adjacent busbar areas and pressure relief areas, so as to separate the busbar area that needs to be filled with the buffer layer 800 and the pressure relief area that needs to be isolated from the buffer layer 800. The buffer body 420 can serve as the boundary of the buffer layer 800. When the material of the buffer layer 800 (such as expanding foam) is injected into the busbar area, the buffer body 420 can prevent the material of the buffer layer 800 from flowing into the pressure relief area, so that the expanding foam can only foam in the busbar area to form the buffer layer 800.

[0056] This application utilizes the buffer body 420 of the acquisition component 400 as a sealant component, saving material costs associated with installing sealant strips at corresponding locations. This application not only saves space on the sealant strip itself but also eliminates the need for reserved operating space and tolerance clearances for its installation, allowing for a more compact internal layout of the battery pack and contributing to increased energy density. Since no additional sealant strip is required, errors such as missed sealant strips, misaligned sealant strips, or weak adhesion are fundamentally eliminated. As long as the acquisition component 400 is correctly installed, the sealant function is automatically activated, improving the first-pass yield and overall product quality.

[0057] like Figure 3 and Figure 4 As shown in a specific embodiment of this application, the battery module 200 includes multiple battery columns arranged along a first direction, and each battery column includes multiple individual battery cells 210 arranged along a second direction, with the first direction perpendicular to the second direction. In each battery column, the large surfaces of two adjacent individual battery cells 210 are arranged adjacent to each other. The arrangement direction of each individual battery cell 210 in the battery column is defined as the second direction, and the arrangement direction of each battery column is defined as the first direction.

[0058] The data acquisition components 400 extend along the second direction, and multiple components are arranged along the first direction. For example, two data acquisition components 400 may be provided for each battery column. This embodiment does not limit the number of data acquisition components 400 corresponding to each battery column; those skilled in the art can select the number of data acquisition components 400 based on their needs.

[0059] like Figures 5-8 As shown, in a specific embodiment of this application, the buffer 420 includes a first buffer 421 and a second buffer 422. The first buffer 421 is disposed between the battery module 200 and the data acquisition body 410, and the second buffer 422 is disposed between the data acquisition body 410 and the battery box cover 120. It should be noted that only one buffer 420 may be provided, for example, the buffer 420 may be disposed between the battery module 200 and the data acquisition body 410.

[0060] In this embodiment, a first buffer 421 and a second buffer 422 are respectively provided on the upper and lower sides of the acquisition body 410, so that the acquisition body 410 is sandwiched between the first buffer 421 and the second buffer 422, so as to provide a better buffer protection effect for the acquisition body 410.

[0061] Furthermore, along the second direction, at least one end of the first buffer 421 extends beyond or is flush with the confluence area. Correspondingly, along the second direction, at least one end of the second buffer 422 may also extend beyond or be flush with the confluence area.

[0062] For example, both ends of the first buffer 421 can extend beyond the confluence area, or one end can be designed to extend beyond the confluence area while the other end is flush with it, to ensure that the first buffer 421 performs a better adhesive-blocking function and prevents the material of the buffer layer 800 from entering the pressure relief area. Similarly, both ends of the second buffer 422 can extend beyond the confluence area, or one end can be designed to extend beyond the confluence area while the other end is flush with it, to ensure that the second buffer 422 performs a better adhesive-blocking function and prevents the material of the buffer layer 800 from entering the pressure relief area.

[0063] In a specific embodiment of this application, the minimum distance from the first buffer body 421 to the edge of the pressure relief part along the first direction is greater than or equal to 2mm, so as to prevent the pressure relief part from being affected by the distance from the first buffer body 421 to the pressure relief part being too small.

[0064] In one specific embodiment of this application, the width of the first buffer body 421 along the first direction can range from 5mm to 30mm. For example, the width of the first buffer body 421 can be 5mm, 7mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, etc. This embodiment does not limit the specific width value of the first buffer body 421; those skilled in the art can arbitrarily choose within the range of 5mm to 30mm based on their needs.

[0065] Correspondingly, along the first direction, the width of the second buffer 422 ranges from 5mm to 30mm. For example, the width of the second buffer 422 is 5mm, 7mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, etc. This embodiment does not limit the specific width value of the first buffer 421, and those skilled in the art can choose any value within the range of 5mm to 30mm based on their needs.

[0066] Those skilled in the art can design the widths of the first buffer 421 and the second buffer 422 to be the same or different based on requirements. This embodiment does not limit the relationship between the widths of the first buffer 421 and the second buffer 422.

[0067] In this embodiment, the widths of the first buffer body 421 and the second buffer body 422 are selected within the range of 5mm to 30mm. This avoids the problem that poor sealing reliability and easy breakage by the material of the buffer layer 800 (such as foam) due to excessive width. It also avoids the problem that excessive width will occupy space and easily interfere with other components.

[0068] In a specific embodiment of this application, the data acquisition body 410 includes a main acquisition path, acquisition branches, and acquisition units. One end of the acquisition branch is connected to the main acquisition path, and the other end is connected to the acquisition unit. It should be noted that the data acquisition body 410 may include multiple acquisition branches, which can be set according to the number of acquisition units. The acquisition units can be set according to the data to be acquired, including but not limited to voltage acquisition units and temperature acquisition units.

[0069] At least one of the first buffer body 421 and the second buffer body 422 is bonded to the collection branch. This arrangement can prevent the collection branch from being pulled and broken when the foaming material of the buffer layer 800 foams.

[0070] Furthermore, each row of battery cells has a pressure relief zone with a collection component 400 on both sides along the first direction. The buffers 420 on both sides of the pressure relief zone, in addition to functioning as baffles, also form a pressure relief channel. This channel protects all pressure relief sections of the same row of battery cells, ensuring that high-temperature, high-pressure substances ejected from any pressure relief section can be safely discharged along a predetermined direction.

[0071] The sampling components 400 would normally need to be arranged on both sides of the pressure relief area. Using the buffers 420 on these existing and necessary sampling components 400 to achieve the function means that no extra space is occupied for the adhesive blocking function, which is conducive to the efficient use of the internal space of the battery pack.

[0072] The side corners of the individual battery cell 210 are generally rounded, which creates gaps between adjacent battery rows, especially at the rounded corners where the gaps are relatively large. In a specific embodiment of this application, a sealant diaphragm 500 is provided between adjacent battery rows, and the sealant diaphragm 500 is provided on the side of the battery row facing the battery box cover 120.

[0073] Without this insulating diaphragm 500, the injected expanding foam (the foam material of the buffer layer 800, which will be used as an example in the following explanation) would flow into the gaps between the battery cells in large quantities. This foam flowing into the gaps not only fails to provide effective filling, fixation, and thermal management, but also results in direct waste. High-performance expanding foam is expensive; this design reduces the amount of foam used, thus lowering costs.

[0074] After the 500 adhesive-blocking diaphragm blocks the main leakage channels, the amount of foam adhesive used becomes predictable and plannable. This allows for more precise control of the amount of adhesive injected during production, avoiding problems such as insufficient injection (affecting performance) or excessive injection (increasing cost and weight) caused by uncontrollable adhesive leakage.

[0075] The core function of the expanding foam is to fill the unused space at the top of the battery pack, providing structural support and securing the battery module 200. If a significant amount of the expanding foam leaks to the bottom, the designed filling volume and density of the upper part may not be guaranteed, affecting its functionality. The foam-blocking separator 500 ensures that the expanding foam is retained in its intended design location, preventing irregularly cured foam at the bottom from causing unpredictable compressive stress on the bottom of the battery or other structures, thus affecting the long-term reliability of the battery.

[0076] Furthermore, the material of the adhesive barrier diaphragm 500 can be PET (Polyethylene terephthalate), PI (Polyimide), PEN (Polyethylene naphthalate twoformic acid glycol este), or PTFE (Polytetrafluoroethylene) membrane.

[0077] In one specific embodiment of this application, the adhesive-blocking diaphragm 500 is disposed between the single cell 210 and the busbar 300. That is, in this embodiment, the adhesive-blocking diaphragm 500 is disposed on the upper side of the single cell 210 and the lower side of the busbar 300.

[0078] The busbar 300 itself has an irregular shape, and there may be a small gap between it and the top surface of the single cell 210. Placing the sealant diaphragm 500 under the busbar 300 can better seal the leakage path from under the busbar 300 to the lower layer, and prevent the foam adhesive from bypassing the sealant diaphragm 500 and leaking into the gaps in the battery.

[0079] In practice, the adhesive-blocking diaphragm 500 can be laid first, and then the manifold 300 can be installed on top of it. The manifold 300 can also help fix the adhesive-blocking diaphragm 500, making it stable during adhesive injection, which is easier to fix than laying the adhesive-blocking diaphragm 500 on the uneven manifold 300.

[0080] The adhesive-blocking diaphragm 500 is located below the manifold 300, allowing the expanding foam to directly wrap around the manifold 300, providing it with additional mechanical fixation and vibration damping. The lower adhesive-blocking diaphragm 500 only prevents the adhesive from leaking downwards, but does not prevent the expanding foam from wrapping the upper part of the manifold 300.

[0081] In another embodiment of this application, the adhesive-blocking diaphragm 500 may also be disposed on the side of the busbar 300 facing the battery box cover 120. That is, in this embodiment, the adhesive-blocking diaphragm 500 is disposed on the upper side of the busbar 300. Although the expanded polystyrene foam is an insulator after curing, its liquid raw materials may contain certain ions, or stress may be generated due to encapsulation. Physically isolating it from the metal surface and welding points of the busbar 300 fundamentally eliminates any potential risks of decreased insulation resistance, local short circuit, or electrochemical corrosion caused by contact with the expanded polystyrene foam.

[0082] like Figure 4As shown, in a specific embodiment of this application, along the second direction, first retaining strips 600 are provided at both ends of the battery module 200. The first retaining strips 600 are arranged on the side of the battery module 200 facing the battery box cover 120. One side (e.g., the upper surface) of the first retaining strip 600 is connected to the battery box cover 120, and the other side (the lower surface) is connected to the battery module 200. Further, along the first direction, second retaining strips 700 are provided at both ends of the battery module 200. The second retaining strips 700 are arranged on the side of the battery module 200 facing the battery box cover 120. One side (the upper surface) of the second retaining strip 700 is connected to the battery box cover 120, and the other side (the lower surface) is connected to the battery module 200. The ends of the first retaining strips 600 and the second retaining strips 700 can be connected sequentially, so that the two first retaining strips 600 and the two second retaining strips 700 can form a rectangular frame structure.

[0083] In this embodiment, a complete sealed enclosure is formed by setting a first sealing strip 600 and a second sealing strip 700. The first sealing strip 600 and the second sealing strip 700, which form a rectangular frame structure, create a continuous and closed annular barrier at the edge of the battery module 200. This is equivalent to establishing a sealing boundary for the entire upper area of ​​the battery module 200, completely confining the foam adhesive within the designed area at the top of the battery module 200.

[0084] This design prevents the expanding foam from leaking through the gaps between the battery module 200 and the battery housing at any end, thus avoiding waste and reducing costs. No matter how complex the edge structure of the battery module 200 is, this continuous sealing boundary effectively prevents the expanding foam from leaking out from any side of the battery module 200, preventing adhesive contamination of the exterior of the battery module 200 or other areas of the battery housing.

[0085] Because the expanding foam is completely confined within the sealing boundary, its expansion and curing process is more uniform and controllable, which helps to achieve the intended support strength and thermal management effect, improving product consistency. Furthermore, the first sealing strip 600 and the second sealing strip 700 also eliminate the possibility that, due to flow uncertainties during the filling and expansion process, the expanding foam might accidentally block the pressure relief section by bypassing the buffer 420 on the acquisition component 400 from the end of the battery module 200.

[0086] In this embodiment, the first adhesive strip 600 and the second adhesive strip 700 can be designed as an integrated structure, which reduces assembly steps, simplifying the process from multiple fixing operations to a single positioning and installation. This also reduces the cumulative error caused by multiple applications and lowers the probability of human errors such as missed or incorrect application. The closed ring structure itself has higher rigidity, and under the pressure of the expanding foam, it can more evenly distribute and withstand the pressure, making it less prone to local deformation or damage, and more stable than a segmented structure. The integrated design also eliminates the risk of joint failure. Segmented adhesive strips are prone to seams at the corners, which are potential weak points and easily crack under pressure or vibration. The integrated design fundamentally eliminates corner seams, achieving a seamless connection and significantly improving reliability.

[0087] In one specific embodiment of this application, the buffer body 420 is connected to the first baffle strip 600 to reduce the seam between them. Figure 7 and Figure 8 As shown, specifically, the end of the buffer body 420 can abut against the side wall of the first baffle strip 600. When the end of the buffer body 420 abuts against the side wall of the first baffle strip 600, the contact surfaces of the two can be fixed by adhesive to fill the gap between them. Alternatively, a groove can be provided in one of the buffer body 420 and the first baffle strip 600, and the other can be embedded in the groove.

[0088] Compared to direct docking, a three-dimensional, deep connection can be created by setting a groove in one component and embedding the other within that groove. For the expanding foam liquid to penetrate, it must bypass the corners of the groove, significantly lengthening and complicating the leakage path and substantially increasing resistance. Multiple contact surfaces are formed between the inner wall of the groove and the embedded component, effectively creating multiple lines of defense and greatly improving the reliability of the seal.

[0089] Under injection pressure, the buffer body 420 will compress and deform, and a simple planar joint may result in a gap at the joint. The groove structure provides a tolerance space, so that even if a small deformation occurs, the embedded part can still remain in the groove, maintaining the continuity of the seal and avoiding seal failure due to deformation.

[0090] The slots also feature a positioning and guiding function. During assembly, operators or automated equipment simply insert one component into the slot of the other, automatically achieving precise positioning without additional adjustments or alignment steps. This design effectively prevents gaps caused by misalignment and reduces the skill requirements for operators. Furthermore, the interlocking slot structure provides a mechanical locking function, effectively resisting shear forces and ensuring that both components maintain the correct relative position during curing, preventing leakage channels caused by displacement.

[0091] In this embodiment, the groove is disposed on the first retaining strip 600 and is located on the side of the first retaining strip 600 facing the battery module 200, that is, the groove is disposed on the lower side of the first retaining strip 600, with the open end of the groove facing downwards, and the end of the buffer body 420 is embedded in the groove. Whether there is only one buffer body 420 or it includes a first buffer body 421 and a second buffer body 422 located on the upper and lower sides of the collection body 410, they can all be embedded in the groove of the first retaining strip 600.

[0092] It should be noted that, in addition to having a downward-facing opening, the groove on the first retaining strip 600 must also have an opening on at least one side facing the buffer body 420 along the width direction (second direction) of the first retaining strip 600, i.e., along the extension direction of the buffer body 420, to facilitate the insertion of the end of the buffer body 420 into the groove. Of course, the groove can be continuous along the extension direction of the buffer body 420, i.e., extending through the width of the first retaining strip 600. The downward-facing groove is inverted, naturally preventing dust and impurities from falling into the groove due to gravity, thus maintaining the cleanliness of the mating area.

[0093] In another embodiment of this application, the groove can also be disposed on the side of the first retaining strip 600 facing away from the battery module 200 (i.e., facing the battery box cover 120), that is, the groove is disposed on the upper side of the first retaining strip 600, with the opening end of the groove facing upwards, and the end of the buffer body 420 is embedded in the groove. It should be noted that, in addition to having an upward-facing opening, the groove on the first retaining strip 600, along the width direction of the first retaining strip 600, that is, along the extension direction of the buffer body 420, must have an opening at least on the side facing the buffer body 420, so as to facilitate the end of the buffer body 420 being embedded in the groove. Of course, along the extension direction of the buffer body 420, the groove can be in a through state, that is, extending through the width of the first retaining strip 600.

[0094] This configuration allows operators or automated equipment to easily place the end of the buffer 420 into the slot from top to bottom, conforming to the most natural assembly action. Gravity acts as an auxiliary force, aiding in placement and maintaining the alignment, and making it easier for the vision inspection system to observe from above and confirm that it is properly embedded.

[0095] When the buffer 420 includes a first buffer 421 and a second buffer 422. For example... Figure 8 and Figure 9 As shown, the groove may include a first groove 601 and a second groove 602 disposed on the first retaining strip 600. The first groove 601 is located on the side of the first retaining strip 600 facing the battery module 200, and the second groove 602 is located on the side of the first retaining strip 600 facing the battery box cover 120. The end of the first buffer body 421 is embedded in the first groove 601, and the end of the second buffer body 422 is embedded in the second groove 602.

[0096] The opening end of the first groove 601 faces downwards, and the end of the first buffer body 421 is embedded in the groove. It should be noted that, in addition to having a downward-facing opening, the first groove 601 also has an opening at least on one side facing the first buffer body 421 along the width direction (second direction) of the first baffle strip 600, i.e., along the extension direction of the first buffer body 421, to facilitate the insertion of the end of the first buffer body 421 into the first groove 601. Of course, the first groove 601 can be in a through-hole state along the extension direction of the first buffer body 421, i.e., extending through the width of the first baffle strip 600. The downward-facing first groove 601 is in an inverted state, naturally preventing dust and impurities from falling into the first groove 601 due to gravity, thus maintaining the cleanliness of the area where it engages with the first buffer body 421.

[0097] The opening end of the second groove 602 faces upward, and the end of the second buffer body 422 is embedded in the second groove 602. It should be noted that, in addition to having an upward-facing opening, the second groove 602 on the first baffle strip 600, along the width direction of the first baffle strip 600, i.e., along the extending direction of the second buffer body 422, must have an opening on at least one side facing the second buffer body 422 to facilitate the embedding of the end of the second buffer body 422 into the second groove 602. Of course, along the extending direction of the second buffer body 422, the second groove 602 can be in a through-hole state, i.e., extending through the width of the first baffle strip 600.

[0098] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0099] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0100] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0101] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery pack, characterized in that, include: The battery housing (100) includes a housing body (110) and a battery cover (120) disposed on the opening side of the housing body (110). The housing body (110) includes a battery compartment (111). A battery module (200) is disposed in the battery compartment (111). The battery module (200) includes multiple individual batteries (210) electrically connected by a busbar (300). The area where the busbar (300) of the battery module (200) is located is the busbar area. The end of each individual battery (210) facing the battery box cover (120) is provided with a pressure relief part. The area where the pressure relief part of the battery module (200) is located is the pressure relief area. The acquisition component (400) includes an acquisition body (410) and a buffer body (420). The acquisition body (410) and the buffer body (420) are stacked along the arrangement direction of the battery module (200) and the battery box cover (120). The acquisition body is used to acquire the voltage and / or temperature of the battery module (200). The buffer body (420) is arranged between the adjacent current collection area and the pressure relief area. A buffer layer (800) is filled between the battery module (200) and the battery box cover (120) and is located in the busbar area.

2. The battery pack as described in claim 1, characterized in that, The battery module (200) includes multiple rows of battery columns arranged along a first direction, and the battery columns include multiple individual cells (210) arranged along a second direction, wherein the first direction is perpendicular to the second direction; The acquisition component (400) extends along the second direction and has multiple lines along the first direction.

3. The battery pack as described in claim 2, characterized in that, The buffer (420) includes: The first buffer (421) is disposed between the battery module (200) and the data acquisition body (410); The second buffer (422) is disposed between the collection body (410) and the battery box cover (120).

4. The battery pack as described in claim 3, characterized in that, Along the second direction, at least one end of the first buffer (421) extends beyond or is flush with the confluence area; And / or, Along the second direction, at least one end of the second buffer (422) extends beyond or is flush with the confluence area.

5. The battery pack as described in claim 3, characterized in that, Along the first direction, the minimum distance from the first buffer body (421) to the edge of the pressure relief part is greater than or equal to 2 mm.

6. The battery pack as described in claim 3, characterized in that, Along the first direction, the width of the first buffer body (421) ranges from 5mm to 30mm; And / or, Along the first direction, the width of the second buffer body (422) ranges from 5mm to 30mm.

7. The battery pack as described in claim 3, characterized in that, The data acquisition body (410) includes a main data acquisition path, a branch data acquisition path, and a data acquisition unit. One end of the branch data acquisition path is connected to the main data acquisition path, and the other end is connected to the data acquisition unit. At least one of the first buffer (421) and the second buffer (422) is bonded to the acquisition branch.

8. The battery pack as described in claim 2, characterized in that, The pressure relief area on any column of batteries is provided with the acquisition component (400) on both sides along the first direction.

9. The battery pack as described in claim 2, characterized in that, A sealing diaphragm (500) is provided between two adjacent battery rows, and the sealing diaphragm (500) is provided on the side of the battery row facing the battery box cover (120).

10. The battery pack as claimed in claim 9, characterized in that, The adhesive-blocking diaphragm (500) is disposed between the single cell (210) and the busbar (300).

11. The battery pack as claimed in claim 9, characterized in that, The adhesive-resistant diaphragm (500) is disposed on the side of the busbar (300) facing the battery box cover (120).

12. The battery pack as claimed in claim 2, characterized in that, Along the second direction, the battery module (200) is provided with first sealing strips (600) at both ends, and the first sealing strips (600) are arranged on the side of the battery module (200) facing the battery box cover (120); One side of the first sealing strip (600) is connected to the battery box cover (120), and the other side is connected to the battery module (200).

13. The battery pack as claimed in claim 12, characterized in that, The end of the buffer body (420) abuts against the side wall of the first baffle strip (600).

14. The battery pack as claimed in claim 12, characterized in that, One of the buffer body (420) and the first rubber strip (600) is provided with a groove, and the other is embedded in the groove.

15. The battery pack as claimed in claim 14, characterized in that, The groove is disposed on the first baffle strip (600) and is located on the side of the first baffle strip (600) facing the battery module (200), and the end of the buffer body (420) is embedded in the groove.

16. The battery pack as claimed in claim 14, characterized in that, The groove is disposed on the first baffle strip (600) and is located on the side of the first baffle strip (600) facing the battery box cover (120), and the end of the buffer body (420) is embedded in the groove.

17. The battery pack as claimed in claim 14, characterized in that, The buffer body (420) includes a first buffer body (421) and a second buffer body (422). The first buffer body (421) is disposed between the battery module (200) and the collection body (410), and the second buffer body (422) is disposed between the collection body (410) and the battery box cover (120). The groove includes a first groove (601) and a second groove (602) disposed on the first baffle strip (600). The first groove (601) is located on the side of the first baffle strip (600) facing the battery module (200), and the second groove (602) is located on the side of the first baffle strip (600) facing the battery box cover (120). The end of the first buffer (421) is embedded in the first groove (601), and the end of the second buffer (422) is embedded in the second groove (602).

18. The battery pack as claimed in claim 12, characterized in that, Along the first direction, the battery module (200) is provided with second sealing strips (700) at both ends, and the second sealing strips (700) are arranged on the side of the battery module (200) facing the battery box cover (120); One side of the second sealing strip (700) is connected to the battery box cover (120), and the other side is connected to the battery module (200).

19. The battery pack as claimed in claim 18, characterized in that, The ends of the first rubber baffle (600) and the second rubber baffle (700) are connected in sequence.

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