Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment, the battery pack comprises a box body, a battery cell, a cover plate, a first colloid and a second colloid, and the box body is provided with a mounting groove; the battery cell is arranged in the mounting groove and is fixedly connected with the box body; the cover plate covers a notch of the mounting groove; the first colloid is connected between the cover plate and the battery cell; and the second colloid is connected between the cover plate and the box body. The first colloid is used between the cover plate and the battery cell, and the second colloid is used between the cover plate and the box body, so that the cover plate is not only adhered to the box body, but also adhered to the battery cell fixed in the box body, and the double adhesion mode obviously increases the adhesion area, thereby improving the overall adhesion strength, and the adhesion strength is improved due to the increase of the adhesion area. Therefore, part or even all of fasteners (such as rivet nuts) for connecting the cover plate and the box body can be omitted, the weight and the cost of the battery pack can be reduced, and the energy density of the battery pack can be improved.

Description

Technical Field

[0001] This application relates to the field of battery energy storage technology, and in particular to a battery pack and electrical equipment. Background Technology

[0002] In related technologies, the battery pack cover is sealed and connected to the housing through silicone foam and a large number of fasteners (such as rivet nuts). The large number of fasteners not only increases the overall weight and cost, but also results in a lower energy density. Utility Model Content

[0003] This application provides a battery pack and electrical device that reduces the weight and cost of the battery pack and increases its energy density, thereby at least partially solving the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, a battery pack is provided, comprising:

[0005] The enclosure has mounting slots;

[0006] The battery cell is disposed in the mounting slot and is fixedly connected to the housing;

[0007] A cover plate that fits into the opening of the mounting groove;

[0008] A first colloid, connecting the cover plate and the battery cell; and,

[0009] The second colloid connects the cover plate and the box body.

[0010] Optionally, the cover plate is a cooling plate, and the first colloid is a first thermally conductive adhesive.

[0011] Optionally, the viscosity of the first thermally conductive adhesive is between 60,000 mPa·s and 200,000 mPa·s.

[0012] Optionally, the battery cell is provided in multiple parts, and the battery pack further includes a busbar that connects the multiple battery cells and is located between the multiple battery cells and the cover plate;

[0013] The first thermally conductive adhesive is connected between the busbar and the cooling plate.

[0014] Optionally, the housing includes a bottom plate and a side plate connected to the outer periphery of the bottom plate. The side plate has an adhesive groove on the side facing away from the bottom of the mounting groove, and the second adhesive is disposed in the adhesive groove.

[0015] Optionally, the adhesive groove extends circumferentially along the opening of the mounting groove;

[0016] The width of the adhesive reservoir is between 5 mm and 10 mm; and / or the depth of the adhesive reservoir is between 3 mm and 5 mm.

[0017] Optionally, the second colloid is a one-component sealant.

[0018] Optionally, the viscosity of the one-component sealant is between 500,000 mPa·s and 1,000,000 mPa·s.

[0019] Optionally, the battery pack further includes a third colloid disposed between the bottom of the mounting groove and the battery cell, so as to fix the battery cell to the housing.

[0020] Optionally, the third colloid is a second thermally conductive adhesive.

[0021] According to a second aspect of this application, an electrical device is provided, comprising a battery pack as described in any of the above claims.

[0022] In the battery pack of this application embodiment, by using a first adhesive between the cover plate and the battery cell, and a second adhesive between the cover plate and the housing, the cover plate is bonded not only to the housing but also to the battery cell fixed inside the housing. This dual bonding method significantly increases the bonding area, thereby improving the overall bonding strength. Because the bonding area is increased and the bonding strength is improved, some or even all of the fasteners (such as rivet nuts) used to connect the cover plate and the housing can be eliminated, reducing the weight and cost of the battery pack and increasing its energy density.

[0023] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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.

[0025] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0026] Figure 1 This is a schematic diagram of the first structure of the battery pack disclosed herein;

[0027] Figure 2 This is a schematic diagram of a second structure of the battery pack disclosed herein;

[0028] Figure 3This is a schematic diagram of the third structure of the battery pack disclosed herein;

[0029] Figure 4 This is a schematic diagram of the fourth structure of the battery pack disclosed herein;

[0030] Figure 5 This is a schematic diagram of the fifth structure of the battery pack disclosed herein.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Battery pack; 1. Cover plate; 11. Cooling plate; 2. First adhesive; 21. First thermally conductive adhesive; 3. Battery cell; 4. Second adhesive; 5. Housing; 51. Mounting slot; 52. Base plate; 53. Side plate; 531. Adhesive tank; 6. Third adhesive; 61. Second thermally conductive adhesive; 7. Fourth adhesive. Detailed Implementation

[0033] 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 protection scope of this application.

[0034] This application provides a battery pack; please refer to [link / reference]. Figure 1 , Figures 1 to 5 This is a schematic diagram of the battery pack provided in an embodiment of this application.

[0035] The battery pack 100 includes a housing 5, a battery cell 3, a cover plate 1, a first gel 2, and a second gel 4.

[0036] The housing 5 has a mounting slot 51. The housing 5 not only provides physical protection for the battery cell 3, but also serves to support and fix the entire battery pack 100. The mounting slot 51 accommodates the battery cell 3, facilitating assembly. The housing 5 is typically made of high-strength materials, such as aluminum alloy or engineering plastics, to ensure its durability and stability under various environmental conditions.

[0037] The battery cell 3 is located in the mounting slot 51 and is fixedly connected to the housing 5. The battery cell 3 is the core component of the battery pack 100 and is responsible for storing and releasing electrical energy.

[0038] The cover plate 1 fits over the opening of the mounting groove 51, serving to seal and protect the battery cell 3. The cover plate 1 can be made of metal or composite material, possessing good mechanical strength and corrosion resistance. The cover plate 1 not only provides physical protection but also, through its cooperation with the first adhesive 2 and the second adhesive 4, achieves a firm bond with the battery cell 3 and the casing 5, ensuring the overall sealing and structural integrity of the battery pack 100.

[0039] The first adhesive 2 connects the cover plate 1 and the battery cell 3, thus connecting the cover plate 1 and the battery cell 3. Since the battery cell 3 is fixedly connected to the housing 5, this design not only enhances the bonding strength between the cover plate 1 and the battery cell 3, but also indirectly enhances the connection stability between the cover plate 1 and the housing 5 through the battery cell 3. This ensures that the entire battery pack 100 maintains good integrity and sealing between the cover plate 1, the battery cell 3, and the housing 5 when subjected to external forces or vibrations.

[0040] The second colloid 4 connects the cover plate 1 and the housing 5, thereby connecting the cover plate 1 and the housing 5, improving the sealing performance of the battery pack 100, preventing moisture, dust and other external substances from entering the battery pack 100, and protecting the battery cell 3 from environmental influences.

[0041] In the technical solution of this application, by using a first adhesive 2 between the cover plate 1 and the battery cell 3, and a second adhesive 4 between the cover plate 1 and the housing 5, the cover plate 1 is bonded not only to the housing 5, but also to the battery cell 3 fixed inside the housing 5. This dual bonding method significantly increases the bonding area, thereby improving the overall bonding strength. Due to the increased bonding area and improved bonding strength, some or even all of the fasteners (such as rivet nuts) used to connect the cover plate 1 and the housing 5 can be eliminated, reducing the weight and cost of the battery pack 100 and increasing its energy density.

[0042] This application does not limit the type of the first colloid 2. The first colloid 2 only needs to be able to bond the cover plate 1 and the battery cell 3 together. The first colloid 2 can be a non-thermal conductive colloid, such as silicone, epoxy resin, acrylic glue, etc.

[0043] In some embodiments, the cover plate 1 is a cooling plate 11, and the first adhesive 2 is a first thermally conductive adhesive 21. In these embodiments, the cover plate 1 is a cooling plate 11, and the first thermally conductive adhesive 21 can effectively conduct the heat generated by the battery cell 3 to the cooling plate 11, which helps to improve the heat dissipation performance of the battery pack 100. The first thermally conductive adhesive 21 firmly bonds the battery cell 3 and the cooling plate 11 while achieving heat conduction, so that the structural stability and thermal management of the battery pack 100 can be carried out synergistically. When the battery pack 100 is subjected to vibration or external force, due to the bonding effect of the first thermally conductive adhesive 21, the relative position between the cooling plate 11 and the battery cell 3 can remain stable, and the heat conduction efficiency will not be affected by factors such as vibration, thereby ensuring the structural and thermal management stability of the battery pack 100.

[0044] Understandably, if the viscosity of the first thermally conductive adhesive 21 is too low, it will be difficult to accurately position the low-viscosity adhesive 21 at the bonding area during assembly, and it will easily flow to other places, causing waste and pollution, increasing cleaning costs. In automated production, it will be difficult to accurately control the amount of adhesive applied, affecting the bonding quality. The first thermally conductive adhesive 21 flowing everywhere cannot form an ideal thermal conduction path between the cell 3 and the cooling plate 11, reducing heat conduction efficiency and affecting battery performance and lifespan. If the viscosity of the first thermally conductive adhesive 21 is too high, greater pressure is required for pressing, increasing equipment costs, and it is difficult to uniformly fill the gap between the cell 3 and the cooling plate 11, affecting the bonding strength and reducing structural stability. High-viscosity thermally conductive adhesive will form uneven thermal conduction paths, generating greater thermal resistance and affecting the heat dissipation of the battery pack 100.

[0045] In some embodiments, the viscosity of the first thermally conductive adhesive 21 is between 60,000 mPa·s and 200,000 mPa·s. In these embodiments, limiting the viscosity range of the first thermally conductive adhesive 21 to between 60,000 mPa·s and 200,000 mPa·s ensures that the first thermally conductive adhesive 21 is easy to apply, avoiding dripping or accumulation, thereby ensuring a good heat conduction path and structural stability, which helps ensure the performance and reliability of the battery pack 100 during manufacturing and use. Specifically, the thermal conductivity of the first thermally conductive adhesive 21 is 0.4–2 W / m·K, the adhesive strength at room temperature can reach 0.5–2 MPa after 1 hour of application without heating, the density is 1.5–2 g / cm³, the bulk strength is 5–10 MPa, and the adhesive strength is 6–10 MPa.

[0046] Understandably, when multiple battery cells 3 are provided, the battery pack 100 also includes a busbar for connecting the multiple battery cells 3 in parallel or in series. In some embodiments, such as... Figure 2 or Figure 5 As shown, the first thermally conductive adhesive 21 connects the multiple battery cells 3 and the cooling plate 11. That is, the first thermally conductive adhesive 21 covers the surface of the multiple battery cells 3 (including the busbar area). In this way, comprehensive heat conduction is achieved, ensuring that the heat from each part is evenly conducted to the cooling plate 11, maintaining the temperature stability of the battery pack 100. Under special working conditions, it can also improve the overall heat dissipation capacity and ensure performance safety. It can enhance structural stability. By bonding the battery cells 3 and the cooling plate 11, it can reduce the internal relative displacement under external force, protect the connection and reduce the risk of failure. It can also simplify the process design. The single adhesive application mode does not require zoning processing, reduces operation steps, facilitates quality control, and improves production efficiency and quality stability.

[0047] In some embodiments, such as Figure 1 , Figure 3 or Figure 4The battery pack 100 includes multiple battery cells 3, and also includes a busbar (not shown in the figure). The busbar connects the multiple battery cells 3 and is located between the multiple battery cells 3 and the cover plate 1. The first thermally conductive adhesive 21 is connected between the busbar and the cooling plate 11. It is understood that the busbar generates a significant amount of heat during the operation of the battery cells 3. Placing the first thermally conductive adhesive 21 between the busbar and the cooling plate 11 allows for targeted heat conduction from the main heat source, the busbar. Compared to covering the entire surface of the multiple battery cells 3 (including the busbar area), this method more efficiently conducts the heat generated by the busbar to the cooling plate 11 for dissipation. This is because the busbar is only a part of the surface of the multiple battery cells 3. Figure 1 , Figure 3 or Figure 4 As shown, the first thermally conductive adhesive 21 is positioned in a specific area, thus reducing unnecessary usage and lowering material costs while meeting thermal management requirements. By placing the first thermally conductive adhesive 21 only between the busbar and the cooling plate 11, interference with electrical connections is avoided, ensuring a good electrical connection between the busbar and the battery cell 3, which contributes to the normal operation of the battery pack 100. During subsequent maintenance, if a problem arises with the first thermally conductive adhesive 21, its placement between the busbar and the cooling plate 11 makes locating and addressing the problem area more precise, making it easier to find the issue compared to searching multiple battery cell surfaces, thus reducing maintenance difficulty and cost.

[0048] In some embodiments, see Figure 1 , Figure 2 , Figure 4 or Figure 5 The housing 5 includes a bottom plate 52 and a side plate 53 connected to the outer periphery of the bottom plate 52. The side plate 53 is located on the side opposite to the bottom of the mounting groove 51 (i.e., Figure 1 The upper side of the middle side plate 53 is provided with an adhesive-containing groove 531, and the second adhesive 4 is disposed in the adhesive-containing groove 531. That is, the bottom plate 52 forms the bottom part of the mounting groove 51, and the side plate 53 surrounds it from all sides, defining the side range of the mounting groove 51. The bottom plate 52 and the side plate 53 together define the mounting groove 51 that can accommodate the battery cell 3. It can be understood that, as Figure 3 As shown, if the side plate 53 is not provided with an adhesive groove 531 on the side facing away from the bottom of the mounting groove 51, the second adhesive 4 is directly provided on the side of the side plate 53 facing away from the bottom of the mounting groove 51 (i.e.) Figure 3Between the upper side of the middle side plate 53 and the cover plate 1, an adhesive connection is achieved between the cover plate 1 and the box body 5. In these embodiments, an adhesive-containing groove 531 is provided on the side of the side plate 53 away from the bottom of the mounting groove 51. The adhesive-containing groove 531 can accurately contain the second adhesive 4, prevent the second adhesive 4 from overflowing and keep the box body 5 clean, and accurately control the amount of the second adhesive 4. It can also improve structural stability and sealing, stabilize the position of the second adhesive 4 to ensure its function, enhance the sealing effect, and fill the gaps by tightly fitting with the groove wall of the adhesive-containing groove 531, preventing external moisture and dust from entering the box body 5.

[0049] In some embodiments, the adhesive groove 531 extends circumferentially along the opening of the mounting groove 51. In these embodiments, the adhesive groove 531 extending circumferentially along the opening of the mounting groove 51 can better fit with the structure around the mounting groove 51. For example, the adhesive groove 531 can form a continuous sealing or connecting strip around the mounting groove 51, that is, the adhesive groove 531 forms an annular groove, effectively preventing external substances (such as dust, moisture, etc.) from entering the interior of the housing 5 from around the mounting groove 51, ensuring a stable connection of the cover plate 1 around the mounting groove 51.

[0050] Understandable, the width of the adhesive reservoir is 531 ( Figure 1 The dimensions (left-right and upward) of the glue-containing groove 531 should be reasonably set. If the width is too small, the glue-containing groove 531 may be too narrow, increasing the difficulty of operation when filling the second glue 4, and may not provide enough space, affecting the sealing or connection effect. If the width is too large, it may occupy too much space of the side panel 53, affecting the overall structural compactness of the box 5, and may also lead to unnecessary material waste. It is also understandable that the depth of the glue-containing groove 531 (…) Figure 1 If the dimensions of the glue tank 531 (vertical and vertical) are too small, the glue tank 531 may not be able to hold a sufficient amount of glue, while if the depth is too large, it may affect the structural strength of the side plate 53 and may increase the processing difficulty and cost.

[0051] In some embodiments, the width of the adhesive receiving groove 531 is between 5 mm and 10 mm. In these embodiments, a width of 5 mm ensures sufficient space to accommodate the adhesive. At this width, filling the adhesive is relatively easy, ensuring proper distribution of the adhesive within the adhesive receiving groove 531, thereby guaranteeing sealing and bonding effectiveness. A width not exceeding 10 mm avoids occupying too much space on the side panel 53. This helps maintain the compactness of the overall structure of the housing 5, prevents material waste due to an excessively wide adhesive receiving groove 531, and does not significantly impact the other structural designs of the housing 5.

[0052] In some embodiments, the depth of the adhesive groove 531 is between 3 mm and 5 mm. In these embodiments, a depth of 3 mm ensures that a sufficient amount of adhesive can be contained. This is important for situations requiring a certain thickness of adhesive to achieve a seal or a secure connection, meeting basic sealing and connection requirements. A depth of no more than 5 mm prevents excessive local weakening of the side plate 53, which helps to ensure the structural strength of the side plate 53, while also controlling the processing difficulty and cost, avoiding complicating the processing due to excessive depth.

[0053] In some embodiments, the second colloid 4 is a one-component sealant. In these embodiments, the second colloid 4 is a one-component sealant, which offers significant ease of use because it does not require mixing with a curing agent or activator and can be directly taken from the packaging and applied, greatly simplifying the application process and improving efficiency. Furthermore, one-component sealants cure rapidly at room temperature, meaning that the expected performance standards can be quickly achieved after application, helping to accelerate the overall project progress. Moreover, since no mixing is required, one-component sealants have a lower risk of leakage or evaporation during storage and use, reducing potential health impacts on operators and mitigating environmental impact. Finally, the cured one-component sealant exhibits stable mechanical properties and durability, ensuring excellent sealing performance.

[0054] In some embodiments, the viscosity of the one-component sealant is between 500,000 mPa·s and 1,000,000 mPa·s. In these embodiments, the viscosity of the one-component sealant is set between 500,000 mPa·s and 1,000,000 mPa·s; this range is chosen to balance application performance and final performance. Such a viscosity ensures good extrudability and filling properties, making it easy to apply and uniformly fill gaps, while also ensuring its ability to maintain its shape on vertical or inverted surfaces, preventing dripping. Furthermore, sealants within this viscosity range typically provide excellent mechanical properties and durability after curing, thus ensuring good sealing. Specifically, the one-component sealant has a bulk strength of 1–3 MPa, an elongation at break of 500–800%, and a bond strength of 1–3 MPa.

[0055] In some embodiments, see Figure 1 , Figure 2 , Figure 3 or Figure 5The battery pack 100 further includes a third adhesive 6, which is disposed between the bottom of the mounting groove 51 and the battery cell 3, thereby fixing the battery cell 3 to the housing 5. In these embodiments, the first adhesive 2 is connected between the cover plate 1 and the battery cell 3, and the third adhesive 6 is connected between the battery cell 3 and the bottom of the mounting groove 51, so that both ends of the battery cell 3 in the groove depth direction of the mounting groove 51 are fixed with adhesive, which can significantly improve the stability of the battery cell 3 in the battery pack 100 and reduce the risk of displacement caused by external vibration or impact. Using the third adhesive 6 to fix the battery cell 3 reduces the need for additional parts compared with other mechanical fixing methods (such as screws), which is beneficial to reducing the weight and cost of the battery pack 100 and increasing its energy density. Of course, in other embodiments, the battery cell 3 can also be fixedly connected to the housing 5 in other ways, for example, see Figure 4 The mounting groove 51 has a slot at its bottom, and the battery cell 3 is secured in the slot. In some embodiments, see... Figure 5 A fourth colloid 7 is provided between the battery cell 3 and the side plate 53 to further enhance the connection strength between the battery cell 3 and its housing 5.

[0056] In some embodiments, the third colloid 6 is a second thermally conductive adhesive 61. In these embodiments, the second thermally conductive adhesive 61 not only has adhesive properties but also thermal conductivity, which can effectively transfer the heat generated by the battery cell 3 to the bottom of the housing 5, thereby helping to dissipate heat, maintain the operating temperature of the battery cell 3 within a suitable range, and improve the overall thermal management efficiency of the battery pack 100.

[0057] According to a second aspect of this application, an electrical device is provided, including a battery pack 100. The structure of the battery pack 100 is as described above. Since the electrical device adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. This application does not specifically limit the type of electrical device, and the electrical device includes, but is not limited to, automobiles, ships, household appliances, and industrial equipment.

[0058] In the description of this application, 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0059] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0060] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0061] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery pack, characterized in that, include: The enclosure has mounting slots; A battery cell is disposed in the mounting slot and fixedly connected to the housing; multiple battery cells are provided. A cover plate, which fits into the opening of the mounting groove, wherein the cover plate is a cooling plate; A busbar connects multiple battery cells, and the busbar is located between the multiple battery cells and the cover plate; A first colloid, connecting the cover plate and the battery cell, wherein the first colloid is a first thermally conductive adhesive, and the first thermally conductive adhesive is also connected between the busbar and the cooling plate; and... The second colloid connects the cover plate and the box body.

2. The battery pack according to claim 1, characterized in that, The viscosity of the first thermally conductive adhesive is between 60,000 mPa·s and 200,000 mPa·s.

3. The battery pack according to claim 1 or 2, characterized in that, The housing includes a bottom plate and a side plate connected to the outer periphery of the bottom plate. The side plate has an adhesive groove on the side opposite to the bottom of the mounting groove, and the second adhesive is disposed in the adhesive groove.

4. The battery pack according to claim 3, characterized in that, The adhesive groove extends circumferentially along the opening of the mounting groove; The width of the adhesive reservoir is between 5 mm and 10 mm; and / or the depth of the adhesive reservoir is between 3 mm and 5 mm.

5. The battery pack according to claim 1, characterized in that, The second colloid is a one-component sealant.

6. The battery pack according to claim 5, characterized in that, The viscosity of the single-component sealant is between 500,000 mPa·s and 1,000,000 mPa·s.

7. The battery pack according to claim 1, characterized in that, The battery pack also includes a third colloid, which is disposed between the bottom of the mounting groove and the battery cell, so as to fix the battery cell to the housing.

8. The battery pack according to claim 7, characterized in that, The third colloid is the second thermally conductive adhesive.

9. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 8.

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