Method for manufacturing a battery pack and a battery pack manufactured by the above method

Abstract

The present invention relates to a method for manufacturing a battery pack and a battery pack manufactured by the method and accommodating a plurality of battery modules including a cell stack in which battery cells are stacked, the battery pack including: a pack case including a module area in which a battery module is seated; and an upper cover coupled to the pack case to cover an upper portion of the battery module, wherein an upper adhesive layer including a thermally conductive adhesive is formed between the battery module accommodated in the pack case and the upper cover.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a battery pack and a battery pack manufactured by the above method. The battery pack of the present invention is characterized in that an adhesive layer containing a thermally conductive adhesive is formed between a battery module housed therein and an upper cover to improve the stability of the battery module.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0166529 filed on December 2, 2022, and all the contents disclosed in the literature of the Korean patent application are included as part of this specification.

Background Art

[0003] Types of secondary batteries currently widely used include lithium-ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, nickel zinc batteries, etc. The operating voltage of such a unit secondary battery cell, that is, a unit battery cell, is about 2.5V to 4.5V. Therefore, when a higher output voltage is required, a plurality of battery cells may be connected in series to form a battery pack. Also, depending on the charge / discharge capacity required for the battery pack, a large number of battery cells may be connected in parallel to form a battery pack. Therefore, the number of battery cells included in the above battery pack can be variously set according to the required output voltage or charge / discharge capacity.

[0004] On the other hand, when a battery pack is configured by connecting a plurality of battery cells in series / parallel, it is common to first configure a battery module including at least one battery cell and then add other components using such at least one battery module to form a battery pack.

[0005] Conventional battery modules typically include at least one cell stack containing battery cells and a metal housing structure in the form of a box, i.e., a module frame, that houses such at least one cell stack. Such conventional battery module structures have the problem that the weight and volume of the module frame itself reduce the energy density of the overall battery pack and increase the overall weight of the battery pack.

[0006] Due to the problems described above, we have attempted to eliminate the conventional module frame configuration that surrounds and protects the cell stack, and instead try a method of housing and arranging the battery pack only in a configuration in which the busbar frame and end plate are attached to the front and rear surfaces where the electrode leads are formed on the cell stack, respectively.

[0007] Figure 1 is a perspective view of the battery module with the module frame removed, including the cell stack 10, the busbar frame 3, and the end plate 2.

[0008] In Figure 1 above, the battery module lacks the module frame that surrounds and protects the cell stack 10. As a result, each battery cell 1 contained within the cell stack 10 is not properly secured. Therefore, when attaching the battery module to a battery pack, it is necessary to first secure the cell stack 10, which is exposed to the outside.

[0009] Figure 2 shows a battery pack with the module frame of Figure 1 attached. As shown in Figure 2(a), the battery pack has multiple battery modules mounted in a pack case 20. The pack case 20 surrounds the sides of each mounted battery module with side walls 40 and protects the top of the battery module from the outside by covering it with an upper cover 30. Figure 2(b) shows a cross-section of the pack case 20 and a part of the battery module mounted in the pack case 20 as shown in Figure 2(a). The lower part of the battery module is supported by a base plate 50 which is the bottom of the pack case 20. At this time, resin 60 may be interposed between the battery module and the base plate 50 to prevent the cell stack 10 contained in the battery module from shaking. The resin 60 serves to fix each battery cell 1 of the cell stack 10 contained in the battery module to the base plate 50. Furthermore, since the resin 60 may also have thermal conductivity properties, it can also play a role in transferring the high-temperature heat generated in the cell stack 10 to the base plate 50 and dissipating the heat to the outside. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Korean Published Patent No. 10-2021-0041950 Specification [Overview of the project] [Problems that the invention aims to solve]

[0011] Therefore, the present invention was devised to solve the above-mentioned problems, and aims to provide a method for manufacturing a battery pack that can effectively fix a battery module without a module frame inside, and a battery pack manufactured by the above method.

[0012] Furthermore, the present invention aims to provide a method for manufacturing a battery pack that can more efficiently dissipate heat from a battery module to the outside, and a battery pack manufactured by the above method.

[0013] Other objects and advantages of the present invention can be understood from the following description and will be more clearly seen from the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations set forth in the claims. [Means for solving the problem]

[0014] The present invention provides a method for manufacturing a battery pack, comprising the steps of: fixing battery modules to each module area within a pack case; attaching an upper cover to the pack case so as to cover the upper part of the battery modules; and injecting a thermally conductive adhesive onto the upper part of the battery modules housed in the pack case, wherein either the upper cover or the pack case includes an injection hole, and the thermally conductive adhesive is injected onto the upper part of the battery modules through the injection hole to form an upper adhesive layer.

[0015] The above-mentioned thermally conductive adhesive can be injected into the space between the upper cover and the battery module through the injection hole.

[0016] Prior to the step of joining the upper cover, the procedure may further include the step of securing block pads to the top of each battery module secured in the module area.

[0017] The block pad described above is window-frame shaped with an open center and can be covered and secured along the upper edge of the battery module.

[0018] The step of injecting the thermally conductive adhesive may further include a step of sealing the injection hole.

[0019] According to the present invention, there is provided a battery pack that houses a plurality of battery modules including a cell stack in which battery cells are stacked, the battery pack including: a pack case including a module region where the battery modules are seated; and an upper cover coupled to the pack case so as to cover an upper portion of the battery module, wherein an upper adhesive layer including a thermally conductive adhesive is formed between the battery module housed in the pack case and the upper cover.

[0020] Any one of the upper cover and the pack case may include a plurality of injection holes corresponding to the respective module regions.

[0021] The pack case includes a base plate, side walls coupled along an edge of the base plate, and a plurality of partition walls partitioning an internal space of the base plate, and the partition walls may partition the internal space of the pack case to form a plurality of module regions.

[0022] The injection holes may be formed in the upper cover corresponding to the respective module regions.

[0023] The upper cover may further include discharge holes for discharging air inside the battery pack to the outside corresponding to the respective module regions.

[0024] The injection holes may be formed in the side walls corresponding to the respective module regions.

[0025] The upper cover may further include discharge holes for discharging air inside the battery pack to the outside corresponding to the respective module regions.

[0026] A window frame-shaped block pad having an open center is further interposed between the battery module housed in each module region and the upper cover, and the upper adhesive layer may be formed only in an opening of the block pad.

[0027] The above-mentioned block pad can seal the space between the upper cover and the battery module to prevent the upper adhesive layer from leaking to the outside.

Advantages of the Invention

[0028] According to the present invention, the stability of the battery pack can be improved by effectively fixing the battery module without a module frame inside the battery pack.

[0029] Also, according to the present invention, the thermal stability of the battery pack can be improved by effectively discharging the heat generated by the battery module installed inside to the outside.

Brief Description of the Drawings

[0030] [Figure 1] It shows a conventional battery module. [Figure 2] It shows a battery pack with the battery module of FIG. 1 installed. [Figure 3] It is a flowchart showing the manufacturing process of the battery pack of the present invention step by step. [Figure 4] It shows the pack case and the upper cover included in the battery pack of the present invention. [Figure 5] It shows that the pack case and the upper cover of FIG. 4 are combined. [Figure 6] It is a partial cross-sectional view showing the process of injecting a thermally conductive adhesive into the battery pack of FIG. 5. [Figure 7] It shows the battery pack according to the first embodiment of the present invention. [Figure 8] It shows a partial cross-section of the battery pack of FIG. 7. [Figure 9] It shows a part of the battery pack according to the second embodiment of the present invention. [Figure 10]The above Figure 9 shows the process of injecting a thermally conductive adhesive into the battery pack. [Figure 11] This shows a part of the battery pack according to the third embodiment of the present invention. [Figure 12] This shows a pack case included in a battery pack according to the fourth embodiment of the present invention. [Figure 13] Figure 12 above shows that a thermally conductive adhesive has been applied to the battery module housed in the pack case. [Figure 14] This shows a battery pack according to a fifth embodiment of the present invention. [Figure 15] This shows a battery pack according to the sixth embodiment of the present invention. [Modes for carrying out the invention]

[0031] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Before that, however, the terms and words used herein and in the claims should not be interpreted to be limited to their ordinary or dictionary meanings, but rather to be interpreted as meanings and concepts consistent with the technical idea of ​​the present invention, based on the principle that an inventor may appropriately define the concepts of terms in order to best describe his own invention.

[0032] Therefore, the embodiments described herein and the configurations shown in the drawings represent only one of the most preferred embodiments of the present invention and do not represent the entire technical concept of the present invention; there are various equivalents and modifications that can substitute for them at the time of filing.

[0033] Furthermore, in describing the present invention, if it is determined that a specific description of a related known configuration or function would likely obscure the gist of the invention, such detailed description will be omitted.

[0034] Since embodiments of the present invention are provided to more fully explain the invention to an ordinary person, the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown schematically for the sake of clarity. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes and proportions.

[0035] The present invention relates to a method for manufacturing a battery pack and a battery pack manufactured by the above method, characterized in that the battery pack of the present invention has an upper adhesive layer L1 containing a thermally conductive adhesive A formed between the battery module M housed inside and the upper cover 200 to improve the stability of the battery module M. Figures 3 to 6 relate to the method for manufacturing a battery pack of the present invention, Figures 7 to 8 relate to a battery pack according to the first embodiment of the present invention, Figures 9 to 10 relate to a battery pack according to the second embodiment of the present invention, Figure 11 relates to a battery pack according to the third embodiment of the present invention, Figures 12 to 13 relate to a battery pack according to the fourth embodiment of the present invention, Figure 14 relates to a battery pack according to the fifth embodiment of the present invention, and Figure 15 relates to a battery pack according to the sixth embodiment of the present invention.

[0036] The manufacturing process of the battery pack of the present invention will be described step by step below with reference to the flowchart in Figure 3, and each embodiment of the battery pack of the present invention will be described with reference to Figures 7 to 15.

[0037] <Battery pack manufacturing method>

[0038] Figure 3 is a flowchart showing the manufacturing process of the battery pack of the present invention, step by step.

[0039] The following explains each step by step, referring to the flowchart above.

[0040] <Safe Settlement Step (S1)>

[0041] This step involves securing the battery modules M to each module area within the pack case 100.

[0042] Figure 4 shows the pack case 100 and upper cover 200 included in the battery pack of the present invention.

[0043] The battery module M of the present invention has a configuration in which the module frame is eliminated, as shown in Figure 1, and includes a cell stack S in which battery cells C are stacked.

[0044] The battery module M, as described above, is secured inside the pack case 100 as shown in Figure 4.

[0045] The pack case 100 includes a base plate 130, a side wall 110 joined along the edge of the base plate 130, and a plurality of partition walls 120 that divide the internal space of the base plate 130.

[0046] The partition wall 120 divides the internal space of the pack case 100 to form multiple module regions, and each battery module M is fixed to one module region. At this time, the base plate 130 can support the lower part of each battery module M.

[0047] A tacky adhesive can be applied to each module region on the base plate 130 to form a lower adhesive layer L2. Therefore, the battery module M, which is attached to the module region, can be fixed to the base plate 130 by bonding with the adhesive of the lower adhesive layer L2. At this time, the adhesive is directly bonded to each battery cell C included in the cell stack S of the battery module M.

[0048] The above adhesive may more specifically include thermally conductive adhesive A.

[0049] The thermally conductive adhesive A is bonded to each battery cell C contained in the cell stack S of the battery module M so as to be in close contact with it, and the heat from the battery cells C can be transferred to the base plate 130 and dissipated.

[0050] Each battery module M, which is fixed to the pack case 100, can remain separated from one another by the partition wall 120.

[0051] <Joining step (S2)>

[0052] This step involves attaching the upper cover 200 to the pack case 100 so as to cover the top of the battery module M.

[0053] Figure 5 shows the pack case 100 and the upper cover 200 from Figure 4 joined together.

[0054] The above battery pack protects the sides and bottom of the battery module M with the pack case 100 and the top of the battery module M with the top cover 200.

[0055] The method for manufacturing a battery pack of the present invention may further include, before the coupling step (S2), a step of attaching block pads P to the upper part of each battery module M that has been attached to the module area.

[0056] The block pad P described above is window-frame shaped with an open center and can be covered and secured along the upper edge of the battery module M.

[0057] The block pad P described above will be explained again with reference to the drawings in the battery pack according to the fourth embodiment, which will be described later.

[0058] <Injection step (S3)>

[0059] This step involves injecting a thermally conductive adhesive A onto the top of the battery module M housed in the pack case 100.

[0060] The battery pack of the present invention is characterized in that either the upper cover 200 or the pack case 100 includes an injection hole h1.

[0061] Referring to Figure 5, multiple injection holes h1 are formed in the upper cover 200.

[0062] The above-mentioned thermally conductive adhesive A is a thermally conductive cooling adhesive that may be provided as a thermal resin.

[0063] The above-mentioned thermally conductive adhesive A can be injected into the module region inside the battery pack through the injection hole h1.

[0064] Figure 6 is a partial cross-sectional view showing the process of injecting thermally conductive adhesive A into the battery pack shown in Figure 5.

[0065] The thermally conductive adhesive A is stored in a separate storage tank or the like and discharged through a separate nozzle N that communicates with the storage tank.

[0066] As shown in Figure 6 above, the injection holes h1 of the present invention are formed in the upper cover 200 at positions corresponding to the module area between the partition walls 120. The nozzles N are inserted into the injection holes h1 simultaneously in a number corresponding to the number of injection holes h1, and the thermal conductive adhesive A is discharged from the injection holes h1 and injected into the space between the upper cover 200 and the battery module M. The thermal conductive adhesive A that fills the space between the upper cover 200 and the battery module M forms an upper adhesive layer L1, fixing the cell stack S of the battery module M to the upper cover 200.

[0067] The method for manufacturing a battery pack of the present invention may further include the step of sealing the injection hole h1 after the step of injecting the thermally conductive adhesive A.

[0068] The above sealing is performed to prevent the thermally conductive adhesive A from leaking out again through the injection hole h1.

[0069] The above sealing can be performed by attaching a tape-like sealing member to the injection hole h1, and it is preferable that the sealing member is watertight. This is to prevent the sealing member attached to the upper cover 200 where the injection hole h1 is located from having its adhesion weakened by the thermally conductive adhesive A.

[0070] <Battery Pack>

[0071] (First Embodiment) Figure 7 shows a battery pack according to the first embodiment of the present invention. More specifically, Figure 7 is a perspective view of the battery pack with a portion cut open to show its internal structure, and Figure 8 shows a cross-section of a portion of the battery pack in Figure 7.

[0072] A battery pack according to the first embodiment of the present invention includes a pack case 100 that includes a module area on which a battery module M is mounted, and an upper cover 200 that is coupled to the pack case 100 so as to cover the upper part of the battery module M.

[0073] The pack case 100 includes a base plate 130, a side wall 110 joined along the edge of the base plate 130, and a plurality of partition walls 120 that divide the internal space of the base plate 130. The partition walls 120 divide the internal space of the pack case 100 and form a plurality of module regions. In this case, the module regions generally have a rectangular shape according to the shape of the battery module M.

[0074] In the battery pack of the present invention shown in Figure 7 above, an injection hole h1 is formed on the upper cover 200.

[0075] The upper cover 200 includes a plurality of injection holes h1 corresponding to each module region. Preferably, each module region may be connected to at least one injection hole h1.

[0076] In the battery pack of the present invention shown in Figure 7 above, an upper adhesive layer L1 containing a thermally conductive adhesive A is formed between the battery module M housed in the pack case 100 and the upper cover 200.

[0077] Referring to Figure 8, a lower adhesive layer L2 is formed on the lower part of the battery module M fixed to the module area, securing the battery module M to the base plate 130, and an upper adhesive layer L1 is formed on the upper part of the battery module M, securing the battery module M to the upper cover 200. Therefore, the battery module M can be stably fixed inside the battery pack by the upper adhesive layer L1 and lower adhesive layer L2, which contain a thermally conductive adhesive A, attached to the top and bottom. In addition, the battery module M can withstand external vibrations and shocks thanks to the upper adhesive layer L1. Furthermore, even if the battery module M generates heat and produces high temperatures, the heat can be transferred to the base plate 130 via the lower adhesive layer L2 and released to the outside, and the heat can be transferred to the upper cover 200 via the upper adhesive layer L1 and released to the outside. In other words, by more effectively dissipating internal heat, it is possible to prevent severe deterioration of the battery module M.

[0078] (Second Embodiment) Figure 9 shows a part of a battery pack according to a second embodiment of the present invention, and Figure 10 shows the process of injecting thermally conductive adhesive A into the battery pack of Figure 9.

[0079] The upper cover 200 included in the battery pack of the present invention may further include exhaust holes h2 that are opened to allow air inside the battery pack to be discharged to the outside, corresponding to each module area.

[0080] The discharge hole h2 must be formed at a certain distance from the injection hole h1, as shown in Figure 9, in order to prevent the thermally conductive adhesive A injected through the injection hole h1 from leaking out through the discharge hole h2 before forming an adhesive layer. For example, if the injection hole h1 is formed at the position of the upper cover 200 corresponding to the center of the module area, the discharge hole h2 may be formed at the position of the upper cover 200 corresponding to the edge of the module area. Or, conversely, if the injection hole h1 is formed at the position of the upper cover 200 corresponding to the edge of the module area, the discharge hole h2 may be formed at the position of the upper cover 200 corresponding to the center of the module area.

[0081] The discharge hole h2 serves as a passage through which internal air can escape, allowing the thermal conductive adhesive A to be smoothly injected through the injection hole h1. At the same time, it also serves to confirm whether the thermal conductive adhesive A has been injected so that it fills the space between the battery module M and the upper cover 200. Since the internal conditions are not visible once the thermal conductive adhesive A is injected into the injection hole h1 via the nozzle N, it is difficult to know when to stop the injection. Therefore, a problem may arise in which the thermal conductive adhesive A overflows again through the injection hole h1.

[0082] However, if an exhaust hole h2 is formed, it is possible to visually confirm whether the thermally conductive adhesive A has been completely injected into the interior through the exhaust hole h2, as shown in Figure 10.

[0083] (Third embodiment) The battery pack of the present invention may further include a sealing material Sm for sealing the injection hole h1.

[0084] Figure 11 shows a part of the battery pack according to the third embodiment of the present invention.

[0085] The battery pack of the present invention can be sealed by attaching a sealing material Sm to the injection hole h1 once the injection of the thermally conductive adhesive A is complete.

[0086] The sealing material Sm is preferably watertight. This is to prevent the adhesion of the sealing material Sm from being weakened by the thermally conductive adhesive A.

[0087] The above-mentioned sealing material Sm can also be used to seal the discharge hole h2 when the discharge hole h2 is formed in the upper cover 200.

[0088] (Fourth Embodiment) The battery pack of the present invention may further include block pads P between the battery modules M housed in each module area and the upper cover 200.

[0089] Figure 12 shows a pack case 100 included in a battery pack according to the fourth embodiment of the present invention, and Figure 13 shows that a thermally conductive adhesive A has been applied to the battery module M housed in the pack case 100 of Figure 12.

[0090] As shown in Figure 12 above, a window-frame-shaped block pad P with an open center is attached to the battery module M housed in each module area. Specifically, when the pack case 100 and the upper cover 200 are joined, the block pad P is interposed between the battery module M and the upper cover 200, sealing the space between the upper cover 200 and the battery module M.

[0091] The block pad P has an open central section. Therefore, when a thermally conductive adhesive A is injected onto the battery module M equipped with the block pad P to form an upper adhesive layer L1, the adhesive layer is formed only at the opening of the block pad P, as shown in Figure 13. In other words, the block pad P seals the space between the upper cover 200 and the battery module M, preventing the adhesive layer from leaking to the leads or busbars of each battery cell C included in the cell stack S of the battery module M.

[0092] (Fifth embodiment) The injection hole h1 and discharge hole h2 of the present invention are not particularly limited in their formation position, as long as they satisfy the condition that they are located on the upper cover 200 corresponding to the module area.

[0093] Figure 14 shows a battery pack according to a fifth embodiment of the present invention.

[0094] As shown in Figure 14 above, the injection hole h1 and the discharge hole h2 are formed at diagonal positions on either one of the module regions.

[0095] (Sixth Embodiment) The battery pack of the present invention includes a plurality of injection holes h1 corresponding to each of the above module regions in either the upper cover 200 or the pack case 100. That is, the battery pack of the present invention may have injection holes h1 formed not only in the upper cover 200 but also in the pack case 100.

[0096] Figure 15 shows a battery pack according to the sixth embodiment of the present invention.

[0097] The injection holes h1 described above are formed in the side wall 110 corresponding to each module region. At this time, the plurality of injection holes h1 are formed so as to be spaced apart at predetermined intervals along the side wall 110.

[0098] The upper cover 200 may further include exhaust holes h2 for expelling air from inside the battery pack to the outside, corresponding to each module area, as shown in Figure 15.

[0099] The present invention has been described in more detail above with reference to the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, there may be various equivalents and modifications that can substitute for them at the time of filing. [Explanation of Symbols]

[0100] 1: (Conventional technology) Battery cell 2: (Conventional technology) End plate 3: (Conventional Technology) Busbar Frame 10: (Conventional Technology) Cell Stack 20: (Conventional technology) Pack case 30: (Conventional technology) Top cover 40: (Conventional technology) Side wall 50: (Conventional technology) Base plate 60: (Conventional Technology) Resin 100: Pack Case 110: Side wall 120: Bulkhead 130: Base plate 200: Top cover A: Thermally conductive adhesive C: Battery cell h1: Injection hole h2: Discharge Hole L1:Top adhesive layer L2: Lower adhesive layer M: Battery Module N: Nozzle P: Block pad S: Cell stack Sm: Sealing material

Claims

1. The steps include securing the battery modules to their respective module areas within the pack case, The steps include: attaching the upper cover to the pack case so as to cover the top of the battery module; The step includes injecting a thermally conductive adhesive onto the top of the battery module housed in the pack case, At least the upper cover includes an injection hole, A method for manufacturing a battery pack, wherein the thermally conductive adhesive is injected into the upper part of the battery module through the injection hole to form an upper adhesive layer.

2. The method for manufacturing a battery pack according to claim 1, wherein the thermally conductive adhesive is injected into the space between the upper cover and the battery module through the injection hole.

3. A method for manufacturing a battery pack according to claim 1, further comprising the step of attaching block pads to the top of each battery module attached to the module area, prior to the step of joining the upper cover.

4. The method for manufacturing a battery pack according to claim 3, wherein the block pad is in the shape of a window frame with an open center and is covered and secured along the upper edge of the battery module.

5. A method for manufacturing a battery pack according to claim 1, further comprising the step of sealing the injection hole after the step of injecting the thermally conductive adhesive.

6. A battery pack that houses a plurality of battery modules, each including a cell stack in which battery cells are stacked, A pack case containing a module area where the battery module is installed, Includes an upper cover which is coupled to the pack case so as to cover the top of the battery module, Between the battery module housed in the pack case and the upper cover, an upper adhesive layer containing a thermally conductive adhesive is formed. The upper cover includes a battery pack with a plurality of injection holes corresponding to each module area.

7. The battery pack according to claim 6, wherein the pack case includes a plurality of injection holes corresponding to each module region.

8. The aforementioned pack case is base plate and A side wall joined along the edge of the base plate, The base plate includes a plurality of partition walls that divide the internal space of the base plate, The battery pack according to claim 6, wherein the partition wall divides the internal space of the pack case to form a plurality of module regions.

9. The battery pack according to claim 8, wherein the injection holes are formed in the upper cover corresponding to each module region.

10. The battery pack according to claim 9, wherein the upper cover further includes exhaust holes for expelling air from inside the battery pack to the outside, corresponding to each module area.

11. The battery pack according to claim 8, wherein the injection holes are formed in the side walls corresponding to each module region.

12. The battery pack according to claim 11, wherein the upper cover further includes exhaust holes for expelling air from inside the battery pack to the outside, corresponding to each module area.

13. Between the battery modules housed in each of the aforementioned module areas and the upper cover, a window-frame-shaped block pad with an open center is further interposed. The battery pack according to claim 6, wherein the upper adhesive layer is formed only at the opening of the block pad.

14. The battery pack according to claim 13, wherein the block pad seals the space between the upper cover and the battery module so as to prevent the upper adhesive layer from leaking out.

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