Battery pack
The battery pack design addresses the challenge of simultaneous adhesive strength and insulation by regulating the distance between the electrode sheet and housing body base, ensuring strong adhesion and insulation, thus enhancing structural strength and safety.
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2026-04-21
- Publication Date
- 2026-06-03
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[0001] The present application is a divisional application; the number of the original application is 2025105681089, the filing date is 30 April 2025 and the title of the invention is ‘Battery pack’. Technical field
[0002] The present invention relates to the technical field of batteries, in particular a battery pack. State of the art
[0003] A battery pack typically consists of a housing and several batteries arranged within it. The underside of the battery is bonded to the base plate of the housing using an adhesive layer to increase the overall strength of the battery pack and prevent its rigidity from being compromised under vibration conditions.
[0004] In current technology, the battery surface is typically encased in an insulating element. To ensure sufficient bond strength between the battery and the base plate of the housing, the metal battery casing usually needs to be exposed on the side of the insulating element facing the base plate so that it can be bonded to the base plate, thus achieving sufficient adhesive strength. However, this configuration carries the risk of insulation failure between the battery and the housing. Content of the invention
[0005] The purpose of the present invention is to provide a battery pack that solves the problem existing in the prior art that insulation performance and adhesive strength cannot be guaranteed simultaneously.
[0006] According to the above concept, the technical solution of the present invention consists of: a battery pack comprising a battery, a base plate and an adhesive layer, wherein the base plate serves to support the battery and the battery is attached to the base plate via the adhesive layer, wherein the battery comprises a housing body, an insulating element and a cell, wherein the cell is arranged in the housing body and comprises several stacked electrode sheets, wherein the insulating element encloses the outer surface of the housing body, wherein the surface of the housing body facing the base plate forms the base of the housing body, wherein the insulating element is provided with an opening that at least partially exposes the base of the housing body, wherein the part of the base of the housing body exposed by the opening is bonded to the adhesive layer; wherein a minimum distance between the electrode sheet and the base of the housing body is a mm, a minimum distance between the opening of the insulating element and the base plate is b mm, and a product of a and b is in the range of 1 to 18.
[0007] Advantages that can be achieved with the above-mentioned technical solution include: By regulating the range of axb to satisfy the aforementioned relationship, both good adhesion between the battery and the base plate are ensured, and short circuits between the base plate and the battery are prevented, thereby increasing the overall structural strength and safety performance of the battery pack. If the value of axb is too high, the excessive distance between the housing and the base plate results in weak adhesion between the battery and the base plate. Under vibration conditions, there is a risk of the battery pack detaching, compromising the overall strength and operational safety of the battery.If the value of axb is too small, the distance between the electrode sheets inside the battery and the base plate decreases, increasing the risk of a short circuit between the cell and the base plate and reducing the insulation performance between the two, which can lead to a short circuit between the battery and the base plate and impair the safety performance of the battery pack. Illustration of the attached figures
[0008] To better illustrate the technical solutions in the embodiments of the present invention, the drawings necessary for describing these embodiments are briefly presented below. It goes without saying that the drawings described below represent only some embodiments of the present invention. A person skilled in the art can easily create further drawings based on the content of the embodiments and these drawings. Fig. Figure 1 is a schematic representation of the structure of a battery pack according to an embodiment of the present invention; Fig. Figure 2 is a cross-sectional view of a battery pack according to an embodiment of the present invention; Fig. 3 is an enlarged view of the in Fig.2 area A shown according to an embodiment of the present invention; Fig. 4 is a first schematic representation of the structure of a battery according to an embodiment of the present invention; Fig. Figure 5 is an enlarged partial view of the cross-section of a first battery pack according to an embodiment of the present invention; Fig. Figure 6 is a schematic representation of the arrangement of the battery, the base plate, the insulating support plate and the opening according to an embodiment of the present invention; Fig. Figure 7 is a schematic representation of the arrangement of the base plate, the insulating support plate and the opening according to an embodiment of the present invention; Fig. Figure 8 is an enlarged partial view of the cross-section of a second battery pack according to an embodiment of the present invention; Fig. Figure 9 is an enlarged partial view of the cross-section of a third battery pack according to an embodiment of the present invention; Fig. Figure 10 is a first enlarged partial view of the cross-section of a fourth battery pack according to an embodiment of the present invention; Fig. Figure 11 is a second enlarged partial view of the cross-section of a fourth battery pack according to an embodiment of the present invention; Fig. Figure 12 is an enlarged partial view of the cross-section of a fifth battery pack according to an embodiment of the present invention; Fig. Figure 13 is a schematic representation of the arrangement of the battery, the second insulating coating and the base plate according to an embodiment of the present invention; Fig.Figure 14 is a second schematic representation of the structure of a battery according to an embodiment of the present invention. In the characters:
[0009] 100. Battery; 110. Housing body; 111. Base of housing body; 120. Insulating element; 121. Opening; 130. Cell; 131. Electrode sheet; 1311. Positive electrode sheet; 1312. Negative electrode sheet; 132. Separator; 140. Insulating support plate; 141. Through hole; 150. Insulating film; 160. Electrode column; 170. Explosion protection valve; 200. Base plate; 300. Adhesive layer; 400. Second insulating layer; 500. Frame structure; 510. Side frame; 520. Cross member; 530. Longitudinal member; 10. Outer box body; 101. Battery compartment; X. First direction. Specific embodiment
[0010] To better explain the technical problems to be solved by the present invention, the technical solutions applied, and the resulting technical effects, the technical solution of the present invention will be explained in more detail below with reference to the accompanying drawings and detailed embodiments. It is understood that the detailed embodiments described here serve only to illustrate the present invention and do not limit it. It should also be noted that, for the sake of clarity, the accompanying drawings show only the parts relevant to the present invention and not all parts.
[0011] It is understood that the term "an embodiment" used throughout this description means that the specific features, structures, or properties associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrase "in an embodiment," which appears at various points throughout this description, does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or properties may be combined in any way in one or more embodiments.
[0012] It should be noted that similar markings and letters represent similar items in subsequent drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.
[0013] In the description of the present invention, the terms "connect," "couple," and "fasten" are to be interpreted broadly unless expressly stated and defined otherwise. They may, for example, denote a permanent connection, a detachable connection, or an integral structure; they may refer to a mechanical connection or an electrical connection; they may signify a direct connection or an indirect connection via an intermediate medium; and they may represent the internal connectivity between two components or an interactive relationship between two components. The specific meaning of the above terms in the context of the present invention will be readily apparent to a person skilled in the art.
[0014] In the present invention, an arrangement of a first feature "above" or "below" a second feature may include direct contact between the first and second features, or it may include the first and second features not being in direct contact, but being connected by another feature between them, unless explicit provisions and limitations apply. Furthermore, an arrangement of a first feature "above," "above," and "on" a second feature may include the first feature being located directly above or obliquely above the second feature, or it may simply indicate that the horizontal height of the first feature is greater than that of the second feature.The arrangement of a first feature “below,” “underneath,” and “below” a second feature implies that the first feature lies directly below or obliquely below the second feature, or it simply indicates that the horizontal height of the first feature is lower than that of the second feature. Unless otherwise specified in the description of this embodiment, “several” specifically refers to two or more features.
[0015] In the description of this embodiment, the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., refer to the directions or positions shown in the accompanying drawings and serve only to clarify and simplify the description, not as an indication or suggestion that the device or component in question has a specific orientation, must be designed in a specific orientation, or must be operated in a specific orientation. They are therefore not to be understood as limiting the present invention. Furthermore, the terms "first" and "second" serve only for differentiation in the description and have no special meaning.
[0016] It should be noted that when an element is described as "attached to another element" or "arranged on another element", it may either be located directly on that other element or may include an intermediate element.
[0017] The technical solution of the present invention will now be explained in more detail with reference to the drawings and by means of detailed embodiments.
[0018] This embodiment provides a battery pack that ensures both the connection strength between the battery and the base plate and the insulation performance.
[0019] For example, the battery pack includes, as shown in Fig.Figure 1 shows a typical outer housing 10 and several batteries 100 arranged within the outer housing 10, the batteries 100 being arranged in groups within the outer housing 10. The outer housing 10 generally comprises a base plate 200, a frame structure 500, and a housing cover (not shown in the figure). The frame structure 500 comprises a side frame 510, a cross member 520, and a longitudinal member 530. The side frame 510 is connected between the base plate 200 and the housing cover and forms a battery compartment. The cross member 520 and the longitudinal member 530 are connected crosswise within the battery compartment and divide the battery compartment into several battery sub-compartments 101, with several batteries 100 being arranged in each of the battery sub-compartments 101. Optionally, both the cross member 520 and the longitudinal member 530 can be present only once or multiple times.This embodiment contains no such limitation.
[0020] Optionally, the battery 100 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. This embodiment is not limited to these. The battery 100 typically comprises a housing 110, a cell 130, and an electrolyte solution (not shown in the figure). The housing 110 serves to accommodate the cell 130 and the electrolyte solution and is provided with at least one positive electrode column and at least one negative electrode column. The cell 130 comprises one or more electrode assemblies, the electrode assembly consisting of a positive electrode sheet, a negative electrode sheet, and a separator, which are stacked or wound.
[0021] The positive electrode array can generally comprise a positive electrode current collector and a positive electrode active layer, with the positive electrode active layer being applied directly or indirectly to the positive electrode current collector. The positive electrode current collector without a positive electrode active layer extends beyond the positive electrode current collector with the positive electrode active layer. The positive electrode current collector without a positive electrode active layer serves as a positive electrode tab, and several positive electrode tabs are stacked on top of each other and electrically connected to the positive electrode column. For example, several stacked positive electrode tabs can be welded directly to the positive electrode column to establish an electrical connection.Alternatively, the cell assembly can also include a positive transfer plate, wherein the multiple stacked positive electrode tabs are welded to one end of the positive transfer plate and the other end of the positive transfer plate is welded to the positive electrode column, so that the positive electrode tabs form an electrical connection with the positive electrode column.
[0022] The negative electrode array can generally comprise a negative electrode current collector and a negative electrode active layer, with the negative electrode active layer being applied directly or indirectly to the negative electrode current collector. The negative electrode current collector without a negative electrode active layer extends beyond the negative electrode current collector with the negative electrode active layer. The negative electrode current collector without a negative electrode active layer serves as a negative electrode tab, and several negative electrode tabs are stacked on top of each other and electrically connected to the negative electrode column. For example, several stacked negative electrode tabs can be welded directly to the negative electrode column to create an electrical connection.Alternatively, the cell assembly can also include a negative transfer plate, wherein the multiple stacked negative electrode tabs are welded to one end of the negative transfer plate and the other end of the negative transfer plate is welded to the negative electrode column, so that the negative electrode tabs form an electrical connection with the negative electrode column. The separator material is arbitrary, for example, polypropylene or polyethylene, etc.
[0023] For example, the battery pack includes, as shown in Fig.Figure 2 shows a battery 100, a base plate 200, and an adhesive layer 300. The base plate 200 serves to support the battery 100. Specifically, the battery 100 is attached to the base plate 200 via the adhesive layer 300; that is, the battery 100 is bonded to the base plate 200 via the adhesive layer 300. It goes without saying that the battery pack also includes a side frame that is firmly connected to the base plate 200, thus forming a housing for the battery 100.
[0024] For example, the battery includes, as in Fig.Figure 2 shows a housing body 110, an insulating element 120, and a cell 130. The cell 130 is arranged within the housing body 110 and comprises several electrode sheets 131. The insulating element 120 encloses the outer surface of the housing body 110 to insulate it from the outside environment. Furthermore, the surface of the housing body 110 facing the base plate 200 is the base surface 111 of the housing body; that is, the base surface 111 of the housing body is the surface of the housing body 110 closest to the base plate 200. As shown in Fig.As shown in Figure 4, the insulating element 120 has an opening 121 that at least partially exposes the base 111 of the housing body; that is, the arrangement of the opening 121 means that the base 111 of the housing body is at least partially exposed. The adhesive layer 300 is at least partially located at the opening 121 and bonded to the base plate 200, thereby bonding the portion of the base 111 of the housing body exposed by the opening 121 to the adhesive layer 300. This bonds the housing body 110 to the base plate 200 via the adhesive layer 300, thus increasing the bond strength between the battery 100 and the base plate 200.
[0025] It should be noted that the insulating material covering the outer surface of the battery 100 (or the housing body 110) consists of the insulating element 120; that is, the insulating material covering the outer surface of the battery 100 (or the housing body 110) except for the notch facing the base plate 200 is the insulating element 120; in other words, any insulating material covering the outer surface of the battery 100 (or the housing body 110) is the insulating element 120.
[0026] In this embodiment, as in Fig. Figure 3 shows the minimum distance between the electrode sheet 131 and the base 111 of the housing body a mm, and the minimum distance between the opening 121 of the insulating element 120 and the base plate 200 is b mm. The product of a and b lies in the range of 1 to 18.
[0027] It should be noted that the product of a and b can take any value between 1 and 18, or a range between any two values. This embodiment contains no such limitation. For example, the product of a and b can take the following values: 1, 1.50, 1.71, 2.38, 3.35, 4.69, 6.28, 7.49, 8.09, 8.54, 9.04, 9.07, 8.43, 8.22, 8.05, 7.14, 6.18, 5.53, 4.96, 10.66, 12.10, 13.59, 14.10, 1.95, 1.85, 5.20, 7.72, 3.98, 3.57, 2.99, 2.77, 2.01, 4.02, 16.00, 17, 18, etc.
[0028] Optionally, the range of 'a' is between 0.6 and 8.0. The value of 'a' can be any value between 0.6 and 8.0, or a range between any two values. For example, 'a' is 0.6, 0.63, 0.69, 0.98, 1.46, 2.04, 2.61, 3.04, 3.53, 4.11, 4.65, 5.02, 5.48, 6.01, 6.55, 7.02, 7.57, 8, 5.03, 6.11, 6.32, 7.23, 7.94, 0.5, 0.49, etc.
[0029] In an optional embodiment, the range of b is between 0.6 and 3.8. The value of b can be any value between 0.6 and 3.8, or a range between any two values. For example, b is 0.6, 3.78, 2.48, 3.42, 3.21, 3.08, 2.87, 2.66, 2.42, 2.2, 1.95, 1.68, 1.5, 1.34, 1.09, 0.88, etc.
[0030] It should be noted that the minimum distance between the electrode sheet 131 and the base surface 111 of the housing body corresponds specifically to the minimum distance between the surface of the electrode sheet 131 closest to the base surface 111 of the housing body and the base surface 111 of the housing body. The minimum distance between the opening 121 of the insulating element 120 and the base plate 200 can be understood as the distance between the surface of the insulating element 120 facing away from the housing body 110 – in a direction perpendicular to the base plate 200 – and the surface of the base plate 200 facing the battery 100.
[0031] The battery pack provided in this embodiment ensures good adhesion between battery 100 and base plate 200 by regulating the range of axb (i.e., the product of a and b) between 1 and 18. This also prevents short circuits between the base plate 200 and battery 100, thereby improving the overall structural strength and safety performance of the battery pack. If the value of axb is too high, the insufficient adhesive surface area between the housing 110 and base plate 200, as well as the excessive distance between the housing 110 and base plate 200, results in weak adhesion between battery 100 and base plate 200. Under vibration conditions, there is a risk of the battery pack detaching, which compromises the overall strength and operational safety of the battery.If the value of axb is too small, the distance between the electrode sheets 131 inside the battery 100 and the base plate 200 decreases, increasing the risk of a short circuit between the cell 130 and the base plate 200 and reducing the insulation performance between the two, which can lead to a short circuit between the battery 100 and the base plate 200 and impair the safety performance of the battery pack.
[0032] Optionally, in this embodiment, the housing body 110 serves to contain the cell 130 and to insulate it from the external environment. The housing body 110 can comprise a casing (not shown in the figure) and a cover plate (not shown in the figure), wherein the casing has an opening at one end and the cover plate is welded to the casing to close the opening and thus form a relatively sealed receiving space for the cell 130. Since the housing body 110 is made of metal such as aluminum or stainless steel, an insulating structure must be provided between the housing body 110 and the base plate 200 to ensure insulation.
[0033] For example, the base plate 200 is made of a metallic material. Thus, the base plate 200 can be made of aluminum, stainless steel, an aluminum alloy, iron, etc. This embodiment does not contain any restrictions in this regard.
[0034] Optionally, the insulating element 120 comprises an insulating protective film and / or an insulating protective coating; that is, the insulating element 120 can comprise exclusively an insulating protective film; it can also comprise exclusively an insulating protective coating; or it can comprise both an insulating protective film and an insulating protective coating, in which case the insulating protective film and the insulating protective coating can be arranged one above the other. It is also possible for part of the insulating element 120 to be configured as an insulating protective film and another part as an insulating protective coating. The specific choice is flexible. This embodiment contains no such limitation.
[0035] It should be noted that the insulating protective film can be applied to the housing body 110 by gluing. The insulating protective coating can be applied to the housing body 110 by coating, and this embodiment does not impose any restrictions in this regard. For example, the insulating protective film can be a blue film.
[0036] For example, the insulating protective film consists of polyethylene terephthalate, polyimide, polypropylene, etc. Materials suitable for the insulating protective coating include polyacrylates, silicones, polyurethanes, epoxy resins, etc. This embodiment does not contain any limitations in this regard.
[0037] In one embodiment and as in Fig. As shown in Figure 3, no further components are arranged between cell 130 and the base 111 of the housing body.
[0038] In further embodiments and as in Fig.As shown in Figure 5, the battery 100 also includes an insulating support plate 140, wherein the insulating support plate 140 is arranged between the cell 130 and the base 111 of the housing body and serves to separate the cell 130 from the base 111 of the housing body. When an insulating support plate 140 is located between the cell 130 and the base 111 of the housing body, the product of a and b lies in the range of 1 to 14.5.
[0039] By placing an insulating support plate 140 between the cell 130 and the base 111 of the housing body, the insulation between the cell 130 and the base 111 of the housing body 110 is increased. This indirectly also improves the insulation between the cell 130 and the base plate 200, thus further ensuring that no short circuit occurs between the cell 130 and the base plate 200, thereby further increasing the safety performance of the battery pack. Furthermore, the insulating support plate 140 ensures insulation between the cell 130 and the base plate 200. Based on this, good insulation is achieved even in areas with reduced axb values, so that, taking the insulation performance into account, the energy density of the battery pack can be appropriately increased.
[0040] For example, the insulating support plate 140 serves to prevent contact between the cell 130 and the housing body 110, thus avoiding the risk of a short circuit. Optionally, the insulating support plate 140 can be made of polypropylene, polyethylene, or polyethylene terephthalate. It goes without saying that the insulating support plate 140 can also be made of other insulating materials. This embodiment does not contain any restrictions in this regard.
[0041] For example, the thickness d1 of the insulating support plate 140 influences the insulating effect between the cell 130 and the base surface 111 of the housing body 110. Optionally, the thickness d1 of the insulating support plate 140 is, as in Fig.Figure 5 shows the thickness in the range of 0.1 mm to 3 mm. As long as the thickness of the insulating support plate 140 is within this thickness range, the insulating support plate 140 consistently exhibits good insulating properties, and the arrangement of the insulating support plate 140 has only a minor effect on the energy density of the battery pack.
[0042] In this embodiment, the thickness d1 of the insulating support plate 140 can assume any value between 0.1 mm and 3 mm, or any range between any two values. This embodiment contains no restrictions in this regard. For example, the thickness d1 of the insulating support plate 140 is 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, etc. The thickness d1 of the insulating support plate 140 must not be too large, as it would otherwise occupy too much space in the housing body 110, which would negatively affect the increase in the energy density of the battery 100. The thickness d1 of the insulating support plate 140 must also not be too small, as this would lead to reduced insulation performance.
[0043] It should be noted that the casing body 110 of the battery 100, as in Fig.Figure 5 shows that the cell 130 typically has an R-edge (i.e., a rounded edge). Specifically, the R-edge is located at the corner of the housing body 110. Because of this R-edge, the cell 130 may not have direct contact with the base 111 of the housing body 110 after being inserted, and thus may not be directly supported by the bottom wall of the housing body 110. This causes the cell 130 to wobble within the housing body 110, which in turn can lead to slight damage to the cell 130. In this embodiment, by arranging the insulating support plate 140 between the cell 130 and the bottom wall of the housing body 110, with a thickness d1 of the insulating support plate 140 ranging from 0.1 mm to 3.0 mm, the cell 130 is able to rest directly on the insulating support plate 140.
[0044] Optionally, the insulating support plate 140 can be firmly connected to the housing body 110 to prevent the insulating support plate 140 from wobbling relative to the housing body 110 and thus improve the uniformity between the insulating support plate 140 and the housing body 110.
[0045] In some optional embodiments and as shown in Fig.As shown in Figure 6, the projection surface of the insulating support plate 140 on the base plate 200 in the first direction X is designated as S1, and the surface of the side of the cell 130 facing the base 111 of the housing body is designated as S2, with the value of S1 / S2 being in the range of 20% to 95%. It should be noted that the first direction X in this embodiment is perpendicular to the base plate 200. It should also be noted that the surface of the cell 130 on the side facing the base 111 of the housing body can be understood as the surface of the cell 130 facing the base 111 of the housing body.
[0046] In this embodiment, the insulating support plate 140 ensures good insulation between the cell 130 and the bottom wall of the housing body 110, as well as between the cell 130 and the base plate 200, when the value of S1 / S2 is within the range mentioned above, so that the risk of a breakdown and short circuit between the cell 130 and the base plate 200 is excluded.
[0047] In this embodiment, the value of S1 / S2 can take any value between 20% and 95%, or any range between any two values. This embodiment contains no restriction in this regard. For example, the value of S1 / S2 is 20%, 30%, 40%, 45%, 50%, 60%, 70%, 80%, 90%, 95%, etc.
[0048] In an optional embodiment and as in Fig.As shown in Figure 6, the projection area of the insulating support plate 140 onto the base plate 200 in the first direction X is designated S1, while the projection area of the opening 121 onto the base plate 200 in the first direction X is designated S3, where S1 ≥ S3. Since the dimensions of the insulating support plate 140 are larger than those of the opening 121, there is a high probability that the projection of the insulating support plate 140 onto the base plate 200 in the first direction X coincides with the projection of the opening 121 onto the base plate 200 in the first direction X. This further ensures that there is no breakdown and short circuit between the cell 130 and the base plate 200 through the opening 121, thus further increasing the safety of the battery pack.
[0049] Still optional and as from Fig.As can be seen in Figure 6, the insulating support plate 140 completely covers the opening 121 in the first direction X (i.e., perpendicular to the base plate 200). This arrangement places an insulating support plate 140 between the section of the base wall of the housing body 110 not covered by the insulating element 120 and the cell 130, thereby optimizing the insulating effect of the insulating support plate 140. This improves the insulating effect between the section of the base wall of the housing body 110 not covered by the insulating element 120 and the cell 130, and furthermore ensures that no short circuit occurs between the base plate 200 and the cell 130.
[0050] In other embodiments, S1 cannot be greater than or equal to S3. For example, as shown in Fig.As shown in Figure 7, the projection area of the insulating support plate 140 on the base plate 200 in a direction perpendicular to the base plate 200 is designated S1, and the projection area of the opening 121 on the base plate 200 in a direction perpendicular to the base plate 200 is designated S3, where S1 < S3. Since the dimensions of the insulating support plate 140 are smaller than those of the opening 121, a gap is created between the insulating support plate 140 and the inner wall of the housing body 110, in which the electrolyte solution can be accommodated. This allows a larger quantity of electrolyte solution to be accommodated in the housing body 110, which in turn improves the wetting performance and the wetting effect of the cell 130 after filling. Optionally, the area of the insulating support plate 140 is smaller than the area of the region in which the insulating element 120 has the opening 121, if the insulating support plate 140 runs parallel to the base plate 200.It should be noted that in this embodiment the insulating support plate 140 can be arranged centrally to the opening 121.
[0051] In an optional embodiment and as in Fig.As shown in Figure 8, the insulating support plate 140 has several through-holes 141, each through-hole 141 extending through the insulating support plate 140 in the first direction X. In this embodiment, the thickness direction of the insulating support plate 140 runs in the same direction as the first direction X. The projection surface of the insulating support plate 140 onto the base plate 200 in the first direction X is designated S1, and the sum of the areas of the several through-holes 141 is designated S4. The value of S4 / S1 is in the range of 5% to 60%. It should be noted that the sum of the areas of the several through-holes 141 specifically corresponds to the sum of the opening areas of the several through-holes 141.
[0052] Due to the arrangement of through-holes 141 in the insulating support plate 140, the electrolyte solution penetrates the housing body 110 during filling and reaches the space between the insulating support plate 140 and the bottom wall of the housing body 110 through the through-holes 141, thus achieving pre-filling. This means that no additional electrolyte solution is required in the gap between the insulating support plate 140 and the housing body 110 during subsequent vibrations of the battery 100. Therefore, the electrolyte solution used for wetting the cell 130 does not decrease, and electrolyte solution is also stored in the through-holes 141 and in this gap, thereby increasing the amount of electrolyte solution used for wetting the cell 130 and improving the wetting performance of the cell 130 after filling, which in turn ensures the performance of the battery 100.
[0053] It should be noted that in this embodiment, the through-hole 141 can have a structure with a constant diameter; that is, the through-hole 141 is a continuous bore 141. The sum of the areas of the multiple through-holes 141 can be the sum of the opening areas of the multiple through-holes 141 or the sum of the cross-sectional areas of the multiple through-holes 141 in the first direction X. This embodiment contains no such limitation. It goes without saying that the through-hole 141 can also have a structure with a varying diameter. This embodiment contains no such limitation.
[0054] It should also be noted that the S4 / S1 value can be any value between 5% and 60%, or any range between any two values. This embodiment contains no such restriction. For example, the S4 / S1 value may be 5%, 10%, 12%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, 55%, 58%, or 60%. The S4 / S1 value must not be too high, as this would impair the insulating effect of the insulating support plate 140 against the cell 130 and the bottom wall of the housing body 110. The S4 / S1 value must not be too low, as this would reduce the amount of electrolyte solution absorbed and thus result in only a slight improvement in the wetting effect of the cell 130 by the electrolyte solution.
[0055] In some optional embodiments, the battery comprises 100 cells, as exemplified in Fig.Figure 9 shows an insulating film 150. The insulating film 150 is located at least partially between the underside of the cell 130 and the base 111 of the housing body, and the product of a and b lies in the range of 1 to 16.2. The arrangement of the insulating film 150 improves the insulation performance between the cell 130 and the bottom wall of the housing body 110, which indirectly increases the insulation safety between the cell 130 and the base plate 200. This ensures that no short circuit occurs between the cell 130 and the base plate 200, further improving the safety performance of the battery pack. In addition, the arrangement of the insulating film 150 provides additional insulation between the cell 130 and the base plate 200.Based on this, a good insulating effect can be achieved even with a reduced value of axb, so that the energy density of the battery pack can be appropriately increased while maintaining the insulation performance.
[0056] Optionally, the insulating film 150 can be made of materials such as polyethylene terephthalate, polyphenylene sulfide, polytetrafluoroethylene, polyethylene, polyimide, polypropylene, acrylic resin, etc. This embodiment does not contain any such limitation.
[0057] In one embodiment, only an insulating film 150 or only an insulating support plate 140 can be provided between the cell 130 and the base surface 111 of the housing body 110. In other embodiments and as described in Fig.As shown in Figure 9, either an insulating film 150 or an insulating support plate 140 can be provided between the cell 130 and the housing body 110. This embodiment contains no such limitation.
[0058] Optionally, if both the insulating support plate 140 and the insulating film 150 are arranged in the housing body 110, the insulating support plate 140 can be positioned between the insulating film 150 and the base surface 111 of the housing body, i.e., the insulating film 150 is located closer to the cell 130 than the insulating support plate 140. In this arrangement, the insulating support plate 140 can be attached to the housing body 110, and the insulating film 150 can be attached to the insulating support plate 140. The connection between the insulating support plate 140 and the housing body 110 is less complex than the connection between the insulating film 150 and the housing body 110, which facilitates the attachment of the insulating support plate 140 and the insulating film 150 in the housing body 110.
[0059] In some optional embodiments, the insulating support plate 140 and the insulating film 150 are rigidly bonded together when both are arranged in the housing body 110. This prevents the insulating film 150 from shifting relative to the insulating support plate 140, thus improving the uniformity between the two. During assembly, both components can be installed in the housing body 110 in a single operation, increasing the assembly efficiency of the battery pack and reducing the assembly effort for both components.
[0060] In one embodiment, the insulating film 150 can have a specific porosity to further improve the wetting effect of the cell 130. For example, the porosity of the insulating film 150 is in the range of 10% to 40%. If the porosity of the insulating film 150 is within this range, the electrolyte solution can adhere to the insulating film 150, thereby increasing the amount of electrolyte solution in the housing body 110. This, in turn, improves the wetting performance of the electrolyte solution on the cell 130, so that the insulating film 150 ensures both the insulating function and the wetting effect of the cell 130. The porosity of the insulating film 150 must not be too high, as this would lead to a lower insulating capacity of the insulating film 150 itself, thus reducing its contribution to the insulation between the cell 130 and the base plate 200.The porosity of the insulating film 150 must also not be too low, as insufficient porosity reduces the absorption of the electrolyte solution and thus leads to only a slight improvement in the wetting effect of the cell 130 by the electrolyte solution.
[0061] It should be noted that the porosity of the insulating film 150 can assume any value between 10% and 40%, or a range between any two values.
[0062] For example, the porosity of the insulating film is 150 10%, 20%, 25%, 30%, 35%, 40%, etc.
[0063] In an optional embodiment and as in Fig.As shown in Figure 9, the thickness d0 of the insulating film 150 is in the range of 1.5 µm to 20 µm. By keeping the thickness d0 of the insulating film 150 within a specific range, better coverage of the underside of the cell 130 by the insulating film 150 is achieved, thereby improving the degree of insulation between the cell 130 and the housing 110. At the same time, the thickness d0 of the insulating film 150 does not occupy too much space inside the housing 110, thus ensuring the energy density of the battery 100 is maintained. The thickness d0 of the insulating film 150 must not be too great, as otherwise it would occupy too much space inside the housing 110, which would negatively affect the increase in the energy density of the battery 100. The thickness d0 of the insulating film 150 must not be too small, as this would impair the encapsulation and the insulating effect of the cell 130.It should be noted that the thickness of the insulating film corresponds to 150 of its dimension in the first direction X.
[0064] It should be noted that the thickness d0 of the insulating film 150 can assume any value between 1.5 µm and 20 µm, or a range between any two values. For example, the thickness d0 of the insulating film 150 is 1.5 µm, 2 µm, 3 µm, 5 µm, 8 µm, 10 µm, 12 µm, 15 µm, 18 µm, 20 µm, etc.
[0065] Optionally, the insulating performance of the insulating film 150 is also influenced by its dielectric constant. In this embodiment, the dielectric constant of the insulating film 150 is in the range of 1.2 F / m to 4.0 F / m. If the dielectric constant of the insulating film 150 is within a certain range, the insulating film 150 exhibits good insulating properties, thus ensuring insulation between the underside of the cell 130 and the bottom wall of the housing body 110. It should be noted that the dielectric constant of the insulating film 150 was measured at a frequency of 1 kHz.
[0066] It should be noted that the dielectric constant of insulating film 150 can take on any value between 1.2 F / m and 4.0 F / m, or a range between any two values. For example, the dielectric constant of insulating film 150 is 1.2 F / m, 1.5 F / m, 2 F / m, 2.5 F / m, 3 F / m, 3.5 F / m, 4 F / m, etc.
[0067] In one embodiment, the insulating film 150 can be applied only to the surface of the cell 130 facing the base 111 of the housing body. For example, the insulating film 150 can partially or completely cover the surface of the cell 130 facing the base 111 of the housing body. In other embodiments, the insulating film 150 covers not only the surface of the cell 130 facing the base 111 of the housing body, but also the side surfaces of the cell 130, thereby completely enclosing the cell 130 and preventing a short circuit between the side surfaces of the cell 130 and the housing body 111.
[0068] For example, cell 130 contains, as in Fig.Figure 10 also shows a separator 132. A separator 132 is arranged between each of the electrode sheets 131, providing insulation between the electrode sheets 131 and thus improving the battery's performance and safety. In this embodiment, there are no particular restrictions regarding the type of separator 132. Any commonly known porous separator 132 with good chemical and mechanical stability can be used. For example, the main material of the separator 132 can be selected from at least one of the following materials: glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator 132 can be a single-layer film or a multi-layer composite film. There are no particular restrictions.If the separator 132 is a multi-layer composite film, the materials of the individual layers can be the same or different. There are no particular restrictions.
[0069] As in Fig.As shown in Figure 10, the distance d2 between the separator 132 and the base 111 of the housing body 110 is smaller than the minimum distance d3 between the electrode sheet 131 and the base 111 of the housing body. In this arrangement, the separator 132 is located closer to the base 111 of the housing body than the electrode sheet 131. Since the separator 132 provides electronic insulation, i.e., it has an insulating function, it can insulate the electrode sheet 131 and thus reduce the risk of breakdown and short circuit between the electrode sheet 131 and the base 111 of the housing body. This also ensures that there is no short circuit between the cell 130 and the base 111 of the housing body, nor between the cell 130 and the base plate 200.
[0070] In an optional embodiment, the thickness d4 of the separator 132 is in the range of 9 µm to 50 µm. If the thickness of the separator 132 is within this range, it provides good support for the cell 130. Since the electrode sheet 131 is located further away from the base 111 of the housing body compared to the separator 132, the electrode sheet 131 can be held in a position further away from the base 111 of the housing body thanks to the good support provided by the separator 132, thus ensuring better insulation between the electrode sheet 131 and the base 111 of the housing body.
[0071] It should be noted that the thickness d4 of separator 132 can take on any value between 9 µm and 50 µm, or a range between any two values. For example, the thickness d4 of separator 132 is 9 µm, 10 µm, 15 µm, 20 µm, 25 µm, 30 µm, 35 µm, 40 µm, 45 µm, 50 µm, etc.
[0072] In one embodiment and as in Fig. 10 or Fig.As shown in Figure 11, the multiple electrode sheets 131 of the cell 130 comprise multiple positive electrode sheets 1311 and multiple negative electrode sheets 1312, the number of positive electrode sheets 1311 and the number of negative electrode sheets 1312 being equal or different. The multiple positive electrode sheets 1311 and the multiple negative electrode sheets 1312 are arranged in a stacked configuration, with the positive electrode sheets 1311 and the negative electrode sheets 1312 alternating in the stacking direction; that is, the battery 100 in this embodiment is a stacked battery. The separator 132 is located in the stacking direction between adjacent positive electrode sheets 1311 and negative electrode sheets 1312 and serves to isolate electrons and allow ions to pass through.In this embodiment, the distance between the separator 132 and the base 111 of the housing body is less than the minimum distance between the electrode sheet 131 and the base 111 of the housing body. It is understood that the battery in this embodiment can also be a wound battery. This embodiment contains no such restriction.
[0073] Optionally, the area of the negative electrode sheet 1312 is typically larger than that of the positive electrode sheet 1311 to optimally utilize the positive electrode material on the positive electrode sheet 1311. To ensure electronic isolation between the positive electrode sheet 1311 and the negative electrode sheet 1312, the area of the portion of the separator 132 located between the positive electrode sheet 1311 and the negative electrode sheet 1312 is larger than the area of the negative electrode sheet 1312.
[0074] An example is how in Fig.As shown in Figure 11, the distance d31 between the negative electrode sheet 1312 and the base 111 of the housing body is smaller than the distance d32 between the positive electrode sheet 1311 and the base 111 of the housing body. Thus, the negative electrode sheet 1312 is closer to the base 111 of the housing body than the positive electrode sheet 1311. Since the negative electrode sheet 1312 has a higher hardness, it provides better support for the cell 130, allowing the negative electrode sheet 1312 and the separator 132 to work together to support the cell 130. This reduces the risk of the cell 130 wobbling back and forth within the housing body 110 in the first direction X, reduces the vibration amplitude of the cell 130 within the housing body 110, and thus lowers the risk of material loss in the cell 130.the risk that the coating of the positive electrode sheet 1311 and the coating of the negative electrode sheet 1312 will flake off, thereby avoiding a short circuit between the electrode sheet 131 and the housing body 110, which would be caused by the coating flaking off onto the base surface 111 of the housing body.
[0075] It should be noted that in this embodiment, when both the positive electrode sheet 1311 and the negative electrode sheet 1312 are present, the minimum distance a of the electrode sheet 131 to the base surface 111 of the housing body corresponds to the distance d31 of the negative electrode sheet 1312 to the base surface 111 of the housing body.
[0076] In an optional embodiment, a first insulating coating (not shown in the figure) is provided on the side of the base 111 of the housing body facing cell 130. By arranging the first insulating coating on the surface of the bottom wall of the housing body 110 facing cell 130, an additional insulating barrier is created between the bottom wall of the housing body 110 and the cell 130, thereby further improving the insulating performance between the housing body 110 and the cell 130. Furthermore, the first insulating coating can be applied by coating, spray coating, bonding, etc., which simplifies the production of the first insulating coating and thus increases the assembly efficiency of the battery 100.
[0077] Optionally, the first insulating coating can be applied to the base surface 111 of the housing body by spraying, gluing, etc. The first insulating coating consists of an insulating material. One of the following can be used as the material for the first insulating coating: polyethylene terephthalate, polyimide, mica, UV-coated material, or epoxy resin. This embodiment does not impose any restrictions in this regard.
[0078] In some optional embodiments, at least one of the three elements – the first insulating coating, the insulating support plate 140, and the insulating film 150 – may be present, or all three may be absent. This embodiment contains no such restriction.
[0079] For example, the thickness of the first insulating layer is in the range of 90 µm to 200 µm. Within this thickness range, the probability of the first insulating layer having weak points is low. Furthermore, it provides good insulation and has only a minor impact on the energy density of the battery 100. The thickness of the first insulating layer must not be too great, as it would otherwise occupy too much space within the housing 110, negatively impacting the increase in the battery 100's energy density. Conversely, the thickness of the insulating layer must not be too thin, as this could lead to weak points in the insulation, which in turn impair its insulating performance.
[0080] Optionally, the thickness of the first insulating layer can be any value between 90 µm and 200 µm, or a range between any two values. For example, the thickness of the first insulating layer could be 90 µm, 100 µm, 110 µm, 120 µm, 130 µm, 150 µm, 170 µm, 200 µm, etc.
[0081] In an optional embodiment and as in Fig.As shown in Figure 12, the battery pack can further comprise a second insulating layer 400, wherein the second insulating layer 400 serves to insulate between the bottom wall of the housing body 110 and the base plate 200. The second insulating layer 400 is arranged at least partially between the adhesive layer 300 and the base plate 200, corresponding to the opening 121. In this arrangement, at least a portion of the second insulating layer 400 is positioned opposite the opening 121, such that the section of the bottom wall of the housing body 110 exposed through the opening 121 faces directly towards the second insulating layer 400. This allows the second insulating layer 400 to act as insulation between the base plate 200 and the housing body 110, thus fulfilling the function of insulating the base plate 200 from the cell 130.Furthermore, the arrangement of the second insulating layer 400 ensures additional insulation between the cell 130 and the base plate 200. Based on this, good insulation can be achieved even with a reduced value of axb, allowing the energy density of the battery pack to be appropriately increased while maintaining the insulation performance. It should be noted that the minimum distance b between the opening 121 of the insulating element 120 and the base plate 200 is greater than or equal to the thickness of the second insulating layer 400.
[0082] Optionally, the second insulating coating 400 can be applied to the base plate 200 by spraying, gluing, etc. The second insulating coating 400 consists of an insulating material. One of the following can be used as the material for the second insulating coating 400: polyethylene terephthalate, polyimide, mica, UV-coated material, or epoxy resin. This embodiment does not impose any restrictions in this regard.
[0083] Optionally, the projection of the second insulating layer 400 in the first direction X completely covers the opening 121. Thus, between the bottom wall of the housing body 110 and the base plate 200, either the insulating element 120 or the second insulating layer 400 is located, or both the insulating element 120 and the second insulating layer 400 are present, thereby improving the insulating effect between the battery 100 and the base plate 200 and avoiding weak points in the insulation.
[0084] In an optional embodiment, one of the following materials can be used for the second insulating layer 400: polyethylene terephthalate, polyimide, mica, UV-coated material, or epoxy resin. The second insulating layer 400 can be sprayed onto the surface of the base plate 200 facing the battery 100 or glued onto the surface of the base plate 200 facing the battery 100. This embodiment contains no such limitation.
[0085] In some optional embodiments, the battery pack includes, as shown in Fig.Figure 13 shows several batteries 100, the several batteries 100 being arranged on the base plate 200. In this embodiment, the several batteries 100 on the base plate 200 can be arranged either in the longitudinal direction of the base plate 200 or in the transverse direction of the base plate 200. It is also possible that some are arranged in the longitudinal direction of the base plate 200 and others in the transverse direction of the base plate 200. This embodiment contains no such limitation.
[0086] In this embodiment, the second insulating coating covers 400, as shown in Fig.As shown in Figure 13, the orthogonal projection in the first direction X covers at least part of the adjacent batteries 100. In this way, the projection of the insulating coating in the first direction X not only covers the base of a single battery 100, but can also partially or completely cover the batteries 100 adjacent to it. When forming the second insulating coating 400, it is not necessary to form a corresponding second insulating coating 400 for each battery 100 individually; rather, several batteries 100 can be assigned to one second insulating coating 400. This increases the overall grouping efficiency of the multiple batteries 100, which in turn increases the assembly efficiency of the battery pack.
[0087] In this embodiment, the thickness d5 of the adhesive layer is 300, as shown in Fig.Figure 2 shows the thickness of the adhesive layer 300, which ranges from 0.5 µm to 3.4 µm. If the thickness of the adhesive layer 300 is within a specific range, it ensures the adhesive strength between the battery 100 and the base plate 200, while simultaneously improving the insulating effect between the battery housing 110 and the base plate 200. The thickness of the adhesive layer 300 must not be too great, as this would result in a greater overall height of the battery pack, which in turn would lead to a lower energy density. Likewise, the thickness of the adhesive layer 300 must not be too small, as this would impair the adhesive strength between the battery 100 and the base plate 200.
[0088] It should be noted that the thickness of the adhesive layer 300 can be any value between 0.5 µm and 3.4 µm, or any value between these two. For example, the thickness of the adhesive layer 300 can be 0.5 µm, 1 µm, 1.5 µm, 1.8 µm, 2 µm, 2.5 µm, 3 µm, 3.4 µm, etc.
[0089] In some embodiments, the dielectric constant of the adhesive layer 300 is in the range of 2.4 F / m to 4.2 F / m. The dielectric constant of the adhesive layer 300 indicates its insulating performance. It should be noted that the dielectric constant of the adhesive layer 300 mentioned in this embodiment was measured at a frequency of 1 MHz and is in the range of 2.4 F / m to 4.2 F / m. If the dielectric constant of the adhesive layer 300 is within the aforementioned range, the adhesive layer 300 exhibits good insulating performance, which can further improve the insulation between the base plate 200 and the battery 100 without compromising the bond strength between the base plate 200 and the battery 100.
[0090] For example, in this embodiment, the base plate 200 can be a heat exchanger plate that serves to dissipate heat from the battery 100. In this case, the product of a and b lies in the range of 1 to 12.8. If axb lies within this range, not only is the connection strength between the battery 100 and the base plate 200 ensured and the insulation performance between the battery 100 and the base plate 200 improved, but the heat dissipation of the battery 100 is also optimized and the risk of thermal runaway of the battery 100 is reduced.
[0091] It should be noted that in this embodiment, the heat exchanger plate refers to the fact that the battery 100 is cooled via the heat exchanger plate. Therefore, the heat exchanger plate can also be referred to as a cooling plate. Cooling channels containing a cooling medium may be provided in the heat exchanger plate. This embodiment does not contain any restrictions in this regard.
[0092] In one embodiment and as in Fig.As shown in Figure 14, the battery comprises an electrode column 160, which is mounted in the housing body 110 and connected to the cell 130, serving for the input and output of electrical energy from the battery 100. The surface of the housing body 110 to which the electrode column 160 is mounted can face the surface of the housing body 110 that faces the opening 121. That is, the electrode column 160 is mounted on the surface of the housing body 110 that faces the base 111 of the housing body, and the product of a and b in this case is in the range of 1 to 11. In this way, the distance between the electrode column 160 and the base plate 200 is relatively large, thus ensuring the insulation performance between the electrode column 160 and the base plate 200 and increasing the safety performance of the battery pack.
[0093] In other embodiments, the electrode column can also be arranged on a side surface of the housing body 110 that adjoins the base surface 111 of the housing body, with the product of a and b lying in the range of 3.5 to 18. In this way, the electrode column is arranged on the side surface of the housing body 110, which improves the grouping efficiency of the multiple batteries 100 in the battery pack, as well as the space utilization of the battery pack and increases the energy density of the battery pack. The product of a and b lies within the aforementioned range, thus preventing a short circuit between the electrode column 160 and the base plate 200, which further increases the safety of the battery pack.
[0094] In one embodiment and as in Fig.As shown in Figure 14, the battery 100 further comprises an explosion protection valve 170, which can be arranged on the surface of the housing body 110 opposite the base 111 of the housing body. In this arrangement, the explosion protection valve 170 is located at a greater distance from the base 111 of the housing body, so that the insulating performance of the base 111 of the housing body is hardly affected. The explosion protection valve 170 serves to release the pressure of the gases contained in the battery 100 in the event of thermal runaway, which leads to a certain internal pressure, so that the hot gases can escape from the battery 100. The explosion protection valve 170 typically achieves pressure relief by forming a notch that serves as a weak point in the housing body 110.The explosion protection valve 170 can be designed as a one-piece construction integrated with the housing body 110 or as a construction independent of the housing body 110. This embodiment contains no such limitation.
[0095] In other embodiments, the explosion protection valve 170 can also be arranged on the base 111 of the housing body 110, i.e., the explosion protection valve 170 and the opening 121 are located on the same side of the battery 100. When the explosion protection valve 170 is arranged on the base 111 of the housing body, a protective sticker for the explosion protection valve 170 can be placed on the side of the explosion protection valve 170 facing away from the housing body 110 to improve the insulation performance (not shown in the figure).The protective sticker for the explosion protection valve is suitable for the explosion protection valve 170 and serves to prevent premature bursting of the explosion protection valve 170 before the breaking conditions are reached, and also prevents the explosion protection valve 170 from breaking due to external forces from outside the battery 100, thereby increasing the reliability of the explosion protection valve 170.
[0096] Optionally, the protective sticker of the explosion protection valve has the same insulating function as the insulating element 120. For example, the protective sticker of the explosion protection valve is made of an insulating material such as polytetrafluoroethylene, polyethylene terephthalate, polyethylene, polypropylene, polyimide, and similar materials. For example, the insulating element 120 includes a protective sticker of the explosion protection valve. In other words, part of the insulating element 120 forms the protective sticker of the explosion protection valve.
[0097] In other embodiments, the explosion protection valve 170 can also be arranged on a side surface of the housing body 110 that adjoins the base surface 111 of the housing body. This embodiment contains no such limitation.
[0098] In the battery pack provided in this embodiment, the insulating element 120 has an opening 121 on the outer surface of the housing body 110, so that the part of the housing body 110 exposed through the opening 121 can be bonded directly to the base plate 200 via the adhesive layer 300, thereby improving the adhesive strength between the battery 100 and the base plate 200 as well as the thermal conductivity of the battery 100. The product of the minimum distance a between the electrode sheet 131 and the base surface 111 of the housing body and the minimum distance b between the opening 121 of the insulating element 120 and the base plate 200 is in the range of 1 to 18, which reduces the risk of breakdown and short circuit both between the electrode sheet 131 of the cell 130 and the bottom wall of the housing body 110 and between the bottom wall of the housing body 110 and the base plate 200, thus ensuring high reliability and safety.
[0099] This embodiment also provides a method for testing the insulation performance, which can be used to test the insulation performance between the battery and the base plate.
[0100] During the test, various values of axb were specified, and the resistance between battery 100 and base plate 200 was measured at these different axb values. Cases where the value of axb was in the range of 1 to 18 were designated as exemplary embodiments. Thirty-two such embodiments were described in this exemplary embodiment. Cases where the value of axb was outside the range of 1 to 18 were designated as comparative examples. Six comparative examples were described in this exemplary embodiment. For each exemplary embodiment and each comparative example, ten batteries of the same type were used, differing only in their axb values, while all other properties were identical. A notch 121 was formed on the surface of the insulating element 120 of battery 100, and the notch 121 was subsequently cleaned with alcohol.After natural drying, adhesive was applied to the surface of the housing body 110 facing the base plate 200 (specifically at the location of the notch), creating an adhesive layer 300. The adhesive-coated battery 100 was then glued to an aluminum sheet (serving as the base plate 200) and cured at 25 °C for 24 hours. The minimum distance a between the electrode sheet 131 and the base surface 111 of the housing body, as well as the minimum distance b between the opening 121 of the insulating element 120 and the base plate 200, were as shown in Table 1 for the various embodiments and comparative examples. All other features were identical. The resistance between the battery 100 and the aluminum sheet was measured using an insulation resistance meter.For this purpose, one output of the insulation resistance meter was connected to the aluminum sheet and the other to the aluminum vent on the battery surface. A DC voltage of 3000 V was then applied between the two terminals, the current was measured, and the resistance between battery 100 and the aluminum sheet was calculated using formula (1). The test results were determined by calculating the average of the resistance measurements of the 10 batteries in each embodiment or comparison example. The specific results are listed in Table 1. If the measured resistance is greater than or equal to 500 MΩ, the insulation between battery 100 and the aluminum sheet is considered satisfactory; if the measured resistance is less than 500 MΩ, the insulation between battery 100 and the aluminum sheet is considered unsatisfactory. R=U / I
[0101] This embodiment also provides a method for measuring the pull-out force, which can be used to test the pull-out force between the battery and the base plate.
[0102] Similarly, for the various embodiments and comparative examples, 10 batteries of the same type were selected, differing only in the values of axb, while all other properties were identical. A notch 121 was formed on the surface of the insulating element 120 of the battery 100, and the notch 121 was subsequently cleaned with alcohol. After natural drying, adhesive was applied to the surface of the housing body 110 facing the base plate (specifically at the location of the notch), creating an adhesive layer 300. The adhesive-coated battery 100 was then glued to an aluminum sheet (serving as the base plate 200) and cured at 25 °C for 24 hours.The minimum distance a between the electrode sheet 131 and the base 111 of the housing body, as well as the minimum distance b between the opening 121 of the insulating element 120 and the base plate 200, were as shown in Table 1 for the various embodiments and comparative examples. All other features were identical. The pull-out force of the battery 100 from the aluminum sheet was measured using an electronic universal testing machine (ETM304C from Wanze Shenzhen) at a speed of 5 mm / min. Ten tests were performed for each embodiment or comparative example, and the average values were determined. The specific results are listed in Table 1. If the measured pull-out force is at least 10 MPa, the bond strength between the battery and the aluminum sheet is considered to be sufficient.If the measured pull-off force is less than 10 MPa, the bond strength between the battery and the aluminum sheet is considered to have failed. Table 1 a0.6 to 8.0 b0.6 to 3.8 axb Insulation power (in MΩ) Tensile strength (in MPa) Example 1 0,63 3,78 2,38 634,4 13,9 Example 2 0,69 1,52 1,05 548,2 13,2 Example 3 0,98 3,42 3,35 638,6 14,3 Example 4 1,46 3,21 4,69 632,7 15,9 Example 5 2,04 3,08 6,28 614,3 16,3 Example 6 2,61 2,87 7,49 602,1 16,1 Example 7 3,04 2,66 8,09 605,6 15,2 Example 8 3,53 2,42 8,54 592,3 15,1 Example 9 4,11 2,2 9,04 589,6 14,6 Example 10 4,65 1,95 9,07 593,7 14,8 Example 11 5,02 1,68 8,43 582,9 14,5 Example 12 5,48 1,5 8,22 588,3 14,2 Example 13 6,01 1,34 8,05 577,5 14,1 Example 14 6,55 1,09 7,14 569,6 13,9 Example 15 7,02 0,88 6,18 562,3 14,1 Example 16 7,57 0,73 5,53 553,8 13,7 Example 17 8 0,62 4,96 548,4 13,5 Example 18 5,03 2,12 10,66 598,7 14,6 Example 19 6,11 1,98 12,10 614,3 14,2 Example 20 6,32 2,15 13,59 619,8 13,9 Example 21 7,23 1,95 14,10 620,2 12,5 Example 22 7,24 2,46 17,81 603,5 11,9 Example 23 0,53 3,67 1,95 612,4 15,3 Example 24 0,49 3,78 1,85 601,6 15,1 Example 25 8,39 0,62 5,20 552,5 12,2 Example 26 8,77 0,88 7,72 579,6 13,5 Example 27 7,65 0,52 3,98 544,3 12,7 Example 28 7,77 0,46 3,57 540,2 12,1 Example 29 0,76 3,94 2,99 604,7 15,5 Example 30 0,69 4,02 2,77 621,8 15,8 Example 31 0,51 3,95 2,01 598,6 14,6 Example 32 8,74 0,46 4,02 543,4 12,3 Comparative example 1 0,72 1,15 0,83 475,4 11,3 Comparative example 2 7,68 2,42 18,59 634,2 9,5 Comparative example 3 0,34 2,76 0,94 462,3 14,2 Comparative example 4 9,03 2,01 18,15 664,2 9,3 Comparative example 5 2,93 0,31 0,91 442,3 12,4 Comparative example 6 4,13 4,42 18,25 621,2 9,3
[0103] A comparison of the experimental data from embodiments 1 to 22 and comparative examples 1 to 6 shows that the battery 100 exhibits good adhesion to the aluminum sheet and the insulating performance between the two is good when a and b satisfy the relationship. A comparison of the experimental data from embodiments 23 to 32 shows that when a is not within the preferred range (i.e., 0.6 to 8.0), but the formula is within the preferred range, an excessively high value for a impairs the space utilization inside the housing body 110 of the battery 100 and reduces the energy density of the battery 100. If a is too small, the battery 100 cannot effectively dissipate the expansion force during the cycling process, which affects the lifetime of the battery 100. When b is outside the preferred range (i.e.,If the formula lies within the preferred range (0.6 to 3.8), an excessively high value of b leads to excessively slow heat dissipation in the area of opening 121 of battery 100, thus impairing the heat dissipation of battery 100. If b is too small, this leads to excessively rapid heat dissipation in the area of opening 121 of battery 100, and in the event of thermal runaway, the heat is quickly transferred to other batteries, compromising the safety of the battery pack.
[0104] It should be noted that these are merely preferred embodiments of the present invention and the technical principles applied therein. Those skilled in the art will recognize that the present invention is not limited to the specific embodiments described herein, but that various obvious modifications, adaptations, and substitutions are possible without departing from the scope of protection of the present invention. Although the present invention has been explained in considerable detail with reference to the foregoing embodiments, it is not limited to them, but can also include further equivalent embodiments without deviating from the fundamental concept of the present invention, the scope of which is determined by the wording of the appended claims.
[0105] The present invention belongs to the technical field of batteries and discloses a battery pack comprising a battery, a base plate and an adhesive layer, wherein the battery is attached to the base plate via the adhesive layer, wherein the battery comprises a housing body, an insulating element and a cell, wherein the cell is arranged in the housing body and comprises several electrode sheets, wherein the insulating element encloses the outer surface of the housing body, wherein the surface of the housing body facing the base plate forms a base surface of the housing body, wherein the insulating element is provided with an opening that at least partially exposes the base surface of the housing body, wherein the part of the base surface of the housing body exposed through the opening is bonded to the adhesive layer.The minimum distance between the electrode sheet and the base of the housing body is a mm, the minimum distance between the opening of the insulating element and the base plate is b mm, and the product of a and b is in the range of 1 to 18. The battery pack provided by the present invention is characterized by a high energy density, good insulation performance, and good thermal conductivity. QUOTES INCLUDED IN THE DESCRIPTION
[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature
[0000] WO 2025105681089
[0001]
Claims
A battery pack comprising a battery (100), a base plate (200), and an adhesive layer (300), wherein the base plate (200) serves to support the battery (100), and the battery (100) is attached to the base plate (200) via the adhesive layer (300), characterized in that the battery (100) comprises a housing body (110), an insulating element (120), and a cell (130), wherein the cell (130) is arranged in the housing body (110) and comprises several electrode sheets (131), wherein the insulating element (120) encloses the outer surface of the housing body (110), wherein the surface of the housing body (110) facing the base plate (200) forms a base surface (111) of the housing body, and wherein the insulating element (120) is provided with an opening (121) that at least partially forms the base surface (111) of the housing body exposes, wherein the adhesive layer (300) is at least partially arranged at the opening (121) and bonded to the base plate (200);wherein a minimum distance between the electrode sheet (131) and the base (111) of the housing body is a mm, a minimum distance between the opening (121) of the insulating element (120) and the base plate (200) is b mm, and a product of a and b is in the range of 1 to 18; wherein a thickness d5 of the adhesive layer (300) is in the range of 0.5 µm to 3.4 µm and the base plate (200) is a heat exchange plate.; Battery pack according to claim 1, characterized in that the battery (100) further comprises an insulating support plate (140), wherein the insulating support plate (140) is arranged between the cell (130) and the base (111) of the housing body and the product of a and b is in the range of 1 to 14.
5. Battery pack according to claim 1, characterized in that the battery (100) further comprises an insulating film (150), wherein the insulating film (150) is located at least partially between the underside of the cell (130) and the base surface (111) of the housing body and the product of a and b lies in the range of 1 to 16.
2. Battery pack according to claim 1, characterized in that the cell (130) further comprises a separator (132), wherein the distance d2 of the separator (132) to the base surface (111) of the housing body is smaller than the minimum distance d3 of the electrode sheet (131) to the base surface (111) of the housing body. Battery pack according to claim 1, characterized in that the multiple electrode sheets (131) comprise multiple positive electrode sheets (1311) and multiple negative electrode sheets (1312), wherein the positive electrode sheet (1311) and the negative electrode sheet (1312) are arranged stacked, and wherein the distance d31 of the negative electrode sheet (1312) to the base surface (111) of the housing body is smaller than the distance d32 of the positive electrode sheet (1311) to the base surface (111) of the housing body. Battery pack according to claim 1, characterized in that a first insulating coating is arranged on the side of the base surface (111) of the housing body facing the cell (130). Battery pack according to claim 1, characterized in that the dielectric constant of the adhesive layer (300) is in the range of 2.4 F / m to 4.2 F / m. Battery pack according to claim 1, characterized in that the battery pack further comprises a second insulating coating (400), wherein the second insulating coating (400) is arranged at least partially between the adhesive layer (300) and the base plate (200), which correspond to the opening (121). Battery pack according to claim 1, characterized in that the product of a and b lies in the range of 1 to 12.
8. Battery pack according to claim 1, characterized in that the battery (100) comprises an electrode column (160), wherein the electrode column (160) is mounted in the housing body (110) and connected to the cell (130), wherein the electrode column (160) is mounted on a surface of the housing body (110) which is opposite the base surface (111) of the housing body, and wherein the product of a and b is in the range of 1 to 11. Battery pack according to claim 1, characterized in that the battery (100) comprises an electrode column (160), wherein the electrode column (160) is mounted in the housing body (110) and connected to the cell (130), wherein the electrode column (160) is arranged on a side surface of the housing body which adjoins the base surface (111) of the housing body, and wherein the product of a and b is in the range of 3.5 to 18. Battery pack according to claim 1, characterized in that a is in the range of 0.6 to 8.0; and / or that b is in the range of 0.6 to 3.8.