Patent Description:
A battery pack generally includes a battery pack shell and a battery disposed within the battery pack shell. The battery pack shell generally includes a frame, a liquid cooling plate and a bottom guard plate at the bottom, and the bottom guard plate and frame are each disposed on the upper and lower sides of the liquid cooling plate. The bottom guard plate, the liquid cooling plate, and the frame are fixed by fasteners, a sealing strip is disposed between the liquid cooling plate and the frame, and the connection between the liquid cooling plate and the frame can be sealed by the sealing strip. Accordingly, how to improve the sealing effect of the sealing strip as well as implementing the fixation of the bottom guard plate, the liquid cooling plate, and the frame is a technical problem to be solved urgently by those skilled in the art.

<CIT> discloses a battery pack lower shell, which comprises a frame, a water cooling plate and a bottom protection plate, wherein the frame is internally fixedly connected with a plurality of crossbeams which are arranged side by side; wherein, be equipped with seal structure between water-cooling board and the frame, and have a plurality of end backplate strengthening ribs of vertically arranging on the backplate at the bottom to be equipped with the sealing strip between backplate at the bottom and water-cooling board, and be formed with inclosed cavity between backplate at the bottom and water-cooling board.

The embodiments of the invention provide a battery pack shell and a battery pack.

For one aspect, embodiments of the invention provide a battery pack shell, including a bottom guard plate, a bottom heat exchange plate and a frame disposed on the bottom guard plate in sequence.

A first sealing strip is disposed between the bottom heat exchange plate and the frame, and the first sealing strip is configured to seal a connection between the bottom heat exchange plate and the frame. The bottom heat exchange plate and the frame are fixed by a first fastener, the bottom guard plate and the frame are fixed by a second fastener, and the bottom heat exchange plate is sandwiched between the bottom guard plate and the frame. The number of the first fasteners and the number of the second fasteners are plural, and each of the first fasteners and each of the second fasteners are disposed around and along the frame into a circle.

A first distance between a center of any adjacent first fasteners and a center of the second fastener is <NUM> to <NUM>, a distance between an edge of the first sealing strip facing the first fastener and a center of any one of the first fasteners is the second distance, and a product of the first distance and the second distance is <NUM><NUM> to <NUM><NUM>.

Accordingly, when the bottom heat exchange plate and the frame are fixed by the first fastener, and the bottom guard plate and the frame are fixed by the second fastener, different fasteners may be configured for fixing the bottom heat exchange plate and the frame and for fixing the bottom guard plate and the frame, respectively. Moreover, when the first sealing strip for sealing the connection between the frame and the bottom heat exchange plate is configured, the sealing of the connection between the frame and the bottom heat exchange plate may be implemented through the first sealing strip.

For another aspect, the embodiments of the invention provide a battery pack, including the battery pack shell provided by the embodiments of the invention, and a battery disposed within the battery pack shell.

For a better understanding of the disclosure, reference may be made to exemplary embodiments shown in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted, or in some instances proportions may have been exaggerated, so as to emphasize and clearly illustrate the features described herein. In addition, related elements or components can be variously arranged, as known in the art. Further, in the drawings, like reference numerals designate same or like parts throughout the several views.

The technical solutions in the exemplary embodiments of the disclosure will be described clearly and explicitly in conjunction with the drawings in the exemplary embodiments of the disclosure. The description proposed herein is just the exemplary embodiments for the purpose of illustrations only, not intended to limit the scope of the disclosure, so it should be understood that and various modifications and variations could be made thereto without departing from the scope of the disclosure.

In the description of the present disclosure, unless otherwise specifically defined and limited, the terms "first", "second" and the like are only used for illustrative purposes and are not to be construed as expressing or implying a relative importance. The term "plurality" is two or more.

In particular, a reference to "the" object or "a" and "an" object is intended to denote also one of a possible plurality of such objects. Unless otherwise defined or described, the terms "connect", "fix" should be broadly interpreted, for example, the term "connect" can be "fixedly connect", "detachably connect", "integrally connect", "electrically connect" or "signal connect". The term "connect" also can be "directly connect" or "indirectly connect via a medium". For the persons skilled in the art, the specific meanings of the abovementioned terms in the present disclosure can be understood according to the specific situation.

Further, in the description of the present disclosure, it should be understood that spatially relative terms, such as "above", "below" "inside", "outside" and the like, are described based on orientations illustrated in the figures, but are not intended to limit the exemplary embodiments of the present disclosure. In the context, it should also be understood that when an element or features is provided "outside" or "inside" of another element(s), it can be directly provided "outside" or "inside" of the other element, or be indirectly provided "outside" or "inside" of the another element(s) by an intermediate element.

In the related art, the battery pack shell may include a bottom guard plate, a liquid cooling plate, and a frame disposed in sequence. The bottom guard plate, the liquid cooling plate, and the frame may be fixed by fasteners, so that the fasteners pass through the bottom guard plate, the liquid cooling plate, and the frame in sequence. Moreover, multiple fasteners may be disposed around and along the frame, and such a fixing method can be referred to point fixing.

Meanwhile, the phrase of passing through herein refers to the following. When the outer surface of the fastener has a thread, the thread connects the bottom guard plate, the liquid cooling plate, and the frame correspondingly; when the outer surface of the fastener has no threads, the bottom guard plate, the liquid cooling plate, and the frame are all closer to the fastener (or the fastener is in contact with the bottom guard plate, the liquid cooling plate, and frame, respectively). Moreover, the phrase of passing through mentioned in the embodiments of the invention may refer to the same meaning.

To implement the sealing of the connection between the liquid cooling plate and the frame, a sealing strip may be disposed between the liquid cooling plate and the frame. With such a point fixing method, when the sealing strip is compressed, the sealing strip may be subject to uneven stress, resulting in uneven compression at different positions and in turn leading to poor sealing reliability and apparent failure in sealing.

Accordingly, the embodiments of the invention provide a battery pack shell configured to improve the sealing effect as well as implementing the fixation of the bottom guard plate, the bottom heat exchange plate, and the frame.

Specifically, an embodiment of the invention provides a battery pack shell, as shown in <FIG> and <FIG>. The battery pack shell may include a bottom guard plate <NUM>, a bottom heat exchange plate <NUM> and a frame <NUM> disposed on the bottom guard plate <NUM> in sequence.

A first sealing strip <NUM> is disposed between the bottom heat exchange plate <NUM> and the frame <NUM>, and the first sealing strip <NUM> is configured to seal the connection between the bottom heat exchange plate <NUM> and the frame <NUM>.

The bottom heat exchange plate <NUM> and the frame <NUM> are fixed by a first fastener <NUM> (meanwhile, this may be referred to point fixing, for the bottom heat exchange plate <NUM>), the bottom guard plate <NUM> and the frame <NUM> are fixed by a second fastener <NUM>, and the bottom heat exchange plate <NUM> is sandwiched between the bottom guard plate <NUM> and the frame <NUM>. Multiple first fasteners <NUM> and second fasteners <NUM> are configured, and each of the first fasteners <NUM> and each of the second fasteners <NUM> are disposed around and along the frame <NUM> into a circle.

That is, while the fixation of the bottom guard plate <NUM> and the frame <NUM> is implemented, the bottom heat exchange plate <NUM> may be sandwiched between the bottom guard plate <NUM> and the frame <NUM> (meanwhile, this may be referred to surface fixing, for the bottom heat exchange plate <NUM>). Accordingly, through the combination of point fixing and surface fixing, the fixation of the bottom heat exchange plate <NUM> may be implemented, and meanwhile stress may be evenly applied to the first sealing strip <NUM>, so that the first sealing strip <NUM> is evenly compressed, thereby improving the sealing effect of the first sealing strip <NUM> and the sealing reliability.

In addition, each of the first fasteners <NUM> and each of the second fasteners <NUM> are disposed around and along the frame <NUM> into a circle, which may be interpreted as follows. With reference to <FIG>, when the orthographic projection of the frame <NUM> on the bottom guard plate (not shown in <FIG>) is an inverted T shape polygon, the first fastener <NUM> and the second fastener <NUM> are disposed along the extending direction of each side of the inverted T shape polygon, and the first fastener <NUM> and the second fastener <NUM> are disposed around the inverted T shape polygon into a circle. To distinguish the first fastener <NUM> from the second fastener <NUM>, the first fastener <NUM> is illustrated by a circle filled with slashes, the second fastener <NUM> is illustrated by a circle filled with black dots.

The orthographic projection of the frame on the bottom guard plate is not limited to the inverted T shape polygon. The inverted T shape polygon is illustrated as an example herein. In actual situations, the orthographic projection of the frame on the bottom guard plate may be configured to any shapes according to actual requirements, which the invention is not limited thereto.

A first distance d1 between the center of any adjacent first fasteners <NUM> and the center of second fastener <NUM> is <NUM> to <NUM>, the distance between one edge (the right edge as shown in <FIG>) of the first sealing strip <NUM> facing the first fastener <NUM> and any one of the first fasteners <NUM> is a second distance d2, and the product of the first distance d1 and the second distance d2 is <NUM><NUM> to <NUM><NUM>.

Note that in some embodiments, the first sealing strip <NUM> may be disposed around and along the frame <NUM>. Moreover, with reference to <FIG>, taking a certain segment of the frame as an example, the extending direction of the first sealing strip <NUM> is the same as the extending direction of the certain segment of the frame <NUM>. Alternatively, there may be a certain angle a between the extending direction of the first sealing strip <NUM> and the extending direction of the certain segment of the frame <NUM>, as shown in <FIG>, but the angle a shall be less than <NUM>°. However, the angle a may be specifically set according to the width of the certain segment of the frame <NUM> (i.e., the length of the frame <NUM> along the F1 direction in <FIG>) and the configuration positions of the first fastener <NUM> and the second fastener <NUM>, as long as there is a certain distance from the first sealing strip <NUM> to the first fastener <NUM> and the second fastener <NUM>. The specific angle a is not limited herein.

Accordingly, when the bottom heat exchange plate and the frame are fixed by the first fastener, and the bottom guard plate and the frame are fixed by the second fastener, different fasteners may be configured for fixing the bottom heat exchange plate and the frame and for fixing the bottom guard plate and the frame, respectively. Moreover, when the first sealing strip for sealing the connection between the frame and the bottom heat exchange plate is configured, the sealing of the connection between the frame and the bottom heat exchange plate may be implemented through the first sealing strip. Meanwhile, setting the first distance between the center of any adjacent first fasteners and a center of the second fastener and the second distance between one edge of the first sealing strip facing the first fastener and the center of any first fastener allows the first sealing strip to be subject to stress more evenly, and the first sealing strip may be effectively and evenly compressed, thereby implementing the fixation of the bottom guard plate, the bottom heat exchange plate, and the frame as well as improving the sealing performance of the battery pack shell.

Note that if the first distance is larger, it means that the first fastener is far away from the second fastener. Meanwhile, the second distance between the first sealing strip and the first fastener may be set smaller, and therefore effective stress may be applied to the first sealing strip through the first fastener and the second fastener, so that the first sealing strip has a sufficient amount of compression, thereby implementing the sealing effect.

If the first distance is smaller, it means that the first fastener is closer to the second fastener. Meanwhile, the second distance between the first sealing strip and the first fastener may be set larger, and therefore effective stress may still be applied to the first sealing strip through the first fastener and the second fastener, so that the first sealing strip has a sufficient amount of compression, thereby implementing the sealing effect.

Moreover, if the product of the first distance and the second distance is too small, it means that both the first distance and the second distance are small. Furthermore, it means that the first fasteners and the second fasteners are configured in a much closer manner. Meanwhile, it means that there is a relatively large quantity of the first fasteners and the second fasteners, which may result in not only assembly difficulties but also a bulky battery pack shell as well as high manufacturing cost.

If the product of the first distance and the second distance is too large, it means that both the first distance and the second distance are large. Furthermore, it means that the distance between the first fastener and the first sealing strip is large, which easily leads to the oversized frame and further the oversized battery pack shell, which is unfavorable to effective space utilization.

Therefore, by setting the first distance and the second distance, the first distance, the second distance, and the product of the first distance and the second distance may all fall in a suitable range, thereby improving the sealing effect of the battery pack shell and reducing the assembly difficulties as well as improving the space utilization.

In some embodiments, the first distance is <NUM> to <NUM>.

The product of the first distance and the second distance is <NUM><NUM> to <NUM><NUM>.

Accordingly, by further setting the first distance, the second distance, and the product of the first distance and the second distance, the sealing effect of the battery pack shell may be further improved, the assembly difficulties may be further reduced, and the space utilization maybe improved.

In some embodiments, as shown in <FIG> and <FIG>, a second sealing strip <NUM> is disposed between the bottom guard plate <NUM> and the bottom heat exchange plate <NUM>, and the second sealing strip <NUM> is configured to seal the connection between the bottom guard plate <NUM> and the bottom heat exchange plate <NUM>.

The distance between one edge (the right edge as shown in <FIG>) of the second sealing strip <NUM> facing the second fastener <NUM> and the center of any second fastener <NUM> is a third distance d3 (the dotted line n in <FIG> represents the central axis of the second fastener <NUM>, and the central point is on the central axis). The fourth distance d4 between the centers of any two adjacent second fasteners <NUM> is <NUM> to <NUM>. The product of the third distance d3 and the fourth distance d4 is <NUM><NUM> to <NUM><NUM>.

With reference to <FIG>, the extending direction of the second sealing strip <NUM> may be the same as the extending direction of the first sealing strip <NUM>, that is, the first sealing strip <NUM> and the second sealing strip <NUM> are correspondingly configured. In actual situations, the extending direction of the second sealing strip <NUM> may also be different from the extending direction of the first sealing strip <NUM>, which may be configured specifically according to actual requirements, which is not limited herein.

Accordingly, with the configuration of the second sealing strip, dust, moisture and the like may be prevented from entering between the bottom heat exchange plate and the bottom guard plate. Therefore, the adverse effects on the heat exchange effect of the bottom heat exchange plate, resulting from dust, moisture, and the like, are prevented, thereby improving the reliability of the battery pack shell.

Moreover, the second fastener is configured to fix the bottom guard plate and the frame, so a certain stress is applied to the second sealing strip through the bottom guard plate. When the third distance between the second sealing strip and the center of the second fastener is larger, and when the fourth distance between the centers of the two second fasteners is also larger, the stress applied to the second sealing strip may be weakened, accordingly the amount of the compression of the second sealing strip is insufficient, and thereby the sealing effect is not good. Meanwhile, due to the large fourth distance, there is a waste of space.

If the third distance between the second sealing strip and the center of the second fastener is larger, the fourth distance may be set smaller, and sufficient stress may still be applied to the second sealing strip through the dense configuration of the second fasteners, so that the second sealing strip has a sufficient amount of compression, thereby implementing a favorable sealing effect.

If the fourth distance between the centers of the two second fasteners is larger, the third distance may be set smaller. Furthermore, even if the second fasteners are disposed sparsely, due to the short distance between the second fastener and the second sealing strip, sufficient stress may still be applied to the second sealing strip, so that the second sealing strip has a sufficient amount of compression, thereby implementing a favorable sealing effect.

In some embodiments, as shown in <FIG>, a side surface (i.e., an upper surface of the bottom heat exchange plate <NUM> shown in <FIG>) of the bottom heat exchange plate <NUM> facing the frame <NUM> has a groove <NUM>, and the first sealing strip <NUM> is located within the groove <NUM>.

Accordingly, the configuration of the first sealing strip may be facilitated, the first sealing strip is prevented from being dislocated or twisted during assembly, and meanwhile, the configuration can also play a role in positioning the assembly of the first sealing strip, which improves the assembly yield of the battery pack shell.

In addition, when the battery pack shell is in an environment at a high temperature, due to the heat exchange effect of the bottom heat exchange plate, the expansion of the first sealing strip and the second sealing strip resulting from the high temperature may be prevented, and thereby the battery pack shell may still have a favorable sealing effect even in an environment at a high temperature.

In some embodiments, to implement the sealing of the connection between the bottom heat exchange plate and the frame, when the first sealing strip is located within the groove, before the first sealing strip is compressed, the thickness of the first sealing strip may be greater than the depth of the groove, so that after the first sealing strip is compressed, and the first sealing strip may be in contact with the frame and the bottom of the groove respectively, thereby implementing the sealing of the connection.

In some embodiments, how thick the first sealing strip specifically is may be set according to factors such as the depth of the groove, the amount of the compression of the first sealing strip, the level of sealing requirements, the set height of the battery pack shell, and the like, which is not limited herein.

In some embodiments, as shown in <FIG>, a side surface (i.e., a lower surface of the bottom heat exchange plate <NUM> shown in <FIG>) of the bottom heat exchange plate <NUM> facing the bottom guard plate <NUM> has a protrusion <NUM> disposed opposite to the groove <NUM>.

The second sealing strip <NUM> is disposed between the bottom guard plate <NUM> and the bottom heat exchange plate <NUM>, and the second sealing strip <NUM> is located on the protrusion <NUM>.

The groove is disposed opposite to the protrusion. In actual manufacture, the groove and the protrusion may be simultaneously processed on the bottom heat exchange plate by stamping.

Accordingly, with the configuration of the second sealing strip on the protrusion, the second sealing strip may be effectively compressed, thereby effectively improving the sealing performance of the connection between the bottom guard plate and the bottom heat exchange plate as well as improving the reliability of the battery pack shell.

In some embodiments, the first fastener is disposed between two adjacent second fasteners.

For example, as shown in <FIG>, two first fasteners <NUM> are disposed between two second fasteners <NUM>. Alternatively, as shown in <FIG> is a partial enlarged schematic view of the solid-lined frame N in <FIG>, one first fastener <NUM> is disposed between two second fasteners <NUM>, and the number of the first fasteners <NUM> disposed between the two second fasteners <NUM> is not limited to one or two but may also be three or more, which may be set according to actual requirements and is not limited herein.

This, accordingly, contributes to improving the fixing effect of the bottom guard plate and the frame as well as the bottom heat exchange plate and the frame and implementing the fixation evenly and effectively. Moreover, the uniformity of the compression of the first sealing strip may be further improved, and the sealing effect of the first sealing strip may be improved.

In some embodiments, as shown in <FIG>, the first fasteners <NUM> and the second fasteners <NUM> are alternately disposed.

Only part of the bottom heat exchange plate <NUM>, part of the bottom guard plate <NUM>, and part of the frame <NUM> are illustrated in <FIG>, so the number of the first fasteners <NUM> and the second fasteners <NUM> is not limited to the number illustrated in <FIG>. The number of the first fasteners <NUM> and the second fasteners <NUM> may be set according to factors, such as the first distance and the fourth distance, which is not limited herein.

Accordingly, by configuring first fasteners and second fasteners in an alternated manner, the fixation of the frame and the bottom heat exchange plate and the fixation of the frame and the bottom guard plate may be implemented, making the fixation more stable and firm, preventing displacement between the frame and the bottom heat exchange plate and/or between the frame and the bottom guard plate, thereby improving the reliability of the battery pack shell and the safety of use.

In some embodiments, as shown in <FIG>, the second fastener <NUM> is located at the center between two adjacent first fasteners <NUM>, so the first fasteners <NUM> and the second fasteners <NUM> can be disposed in a more even manner, further allowing the fixation more stable and firm, and, therefore, improving the reliability of the battery pack shell and the safety of use.

In some embodiments, as shown in <FIG> and <FIG>, the first fasteners <NUM> and the second fasteners <NUM> are disposed along the extending direction of the first sealing strip <NUM>.

Accordingly, the bottom heat exchange plate, the bottom guard plate, and the frame may subject to stress more evenly, meanwhile the space occupied by the first fastener and the second fastener in the width direction of the first sealing strip may be reduced, and further the size of the frame in the width direction of the first sealing strip is prevented from being too large, thereby preventing the waste of space and improving space utilization. In addition, with the configuration of the first fastener and the second fastener along the extending direction of the first sealing strip, adverse effects on the configuration of the first sealing strip and the second sealing strip may be further prevented; and the complexity of the configuration of the first sealing strip, the second sealing strip, the groove, and the protrusion is further prevented, thereby reducing the difficulty in manufacturing the battery pack shell as well as improving the manufacturing yield.

In some embodiments, as shown in <FIG>, a sealant <NUM> is disposed between the frame <NUM> and the bottom heat exchange plate <NUM>, and there is a distance between the sealant <NUM> and the first sealing strip <NUM>.

In <FIG>, the distance between the sealant <NUM> and the first sealing strip <NUM> may be represented by d5.

Moreover, as shown in <FIG>, when the bottom heat exchange plate <NUM> and the frame <NUM> are fixed by the first fasteners <NUM>, the sealant <NUM> may be located at the periphery of the first fasteners <NUM>.

Accordingly, a sealant may be used to seal the first fastener near the first fastener to implement outer sealing, i.e. to implement the sealing at the position of the first fastener, the inner sealing may be implemented through the first sealing strip, therefore, double sealing may be implemented, and the sealing effect of the connection may be effectively improved.

In addition, because the sealant is generally fluid, the sealant may spread around due to the pressing of the bottom heat exchange plate and the frame during connection. Since there is a distance between the sealant and the first sealing strip giving space for the spread of the sealant, the contact between the sealant and the first sealing strip may be further prevented, and the failure of the first sealing strip resulting from the contact between the sealant and the first sealing strip is further prevented, thereby further improving the sealing effect of the connection.

In some embodiments, the value of d5 may be set according to factors such as the fluidity of the sealant, the amount of the sealant used, and the like. For example, if the fluidity of the sealant is high and the amount of the sealant used is large, the value of d5 may be set larger to prevent the sealant from spreading into the groove to be in contact with the sealing strip; if the fluidity of the sealant is low and the amount used is small, the value of d5 may be set smaller to prevent the waste of space, which contributes to saving space, thereby reducing the size of the battery pack shell.

In some embodiments, as shown in <FIG>, the orthographic projections of the second fastener <NUM> and the bottom heat exchange plate <NUM> on the bottom guard plate <NUM> are not overlapped.

That is, the second fastener is required to pass through the bottom guard plate and the frame without passing through the bottom heat exchange plate, which reduces the number of structures through which the second fastener passes, facilitates the manufacturing, and reduces the difficulty in assembly. In addition, the direct fixation of the bottom guard plate and the frame may be implemented, and the stability of fixing the bottom guard plate and the frame may be improved.

In some embodiments, as shown in <FIG> and <FIG>, the bottom heat exchange plate <NUM> has an avoidance structure <NUM>, and the second fastener <NUM> passes through the avoidance structure <NUM>.

The avoidance structure may be a notch (as shown in <FIG>) or a through hole (as shown in <FIG>), which may be set according to actual requirements, which is not limited herein.

Moreover, the phrase of passing through means that the second fastener only passes through the space yielded by the avoidance structure, and as shown in <FIG>, there is a certain distance h0 between the second fastener <NUM> and the edge of the bottom heat exchange plate <NUM>, so that the second fastener <NUM> may not be in contact with the bottom heat exchange plate <NUM>.

Accordingly, since the bottom heat exchange plate is located between the bottom guard plate and the frame, when the bottom guard plate and the frame are fixed by the second fastener, with the configuration of the avoidance structure, the second fastener is prevented from passing through the bottom heat exchange plate, and the second fastener passes through the avoidance structure, thereby facilitating the assembly difficulty and improving the assembly efficiency.

In some embodiments, the size of the avoidance structure may be set according to the configuration position of the second fastener and the diameter of the fastening column of the second fastener (as the d0 shown in <FIG>), as long as it is guaranteed that the fastening column may pass through the avoidance structure, which is not limited herein.

In some embodiments, as shown in <FIG> and <FIG>, the bottom heat exchange plate <NUM> has an edge region Qc in contact with the frame <NUM>, and the orthographic projection of the first fastener <NUM> on the bottom heat exchange plate <NUM> is located in the edge region Qc.

The bottom guard plate <NUM> has a bent portion <NUM>. The bent portion <NUM> is bent toward the frame <NUM> and in contact with at least part of the edge region Qc of the bottom heat exchange plate <NUM>.

As shown in <FIG>, both the bottom guard plate <NUM> and the bottom heat exchange plate <NUM> are located below the frame <NUM>, and the bottom heat exchange plate <NUM> is located between the bottom guard plate <NUM> and the frame <NUM>. The edge region Qc of the bottom heat exchange plate <NUM> is in direct contact with the frame <NUM>. When the bottom guard plate <NUM> and the frame <NUM> are fixed by the second fasteners <NUM>, the bent portion <NUM> of the bottom guard plate <NUM> can be bent upward, so that the bent portion <NUM> is in contact with at least part of the edge region Qc of the bottom heat exchange plate <NUM>, and during fixing, effective fixation of the bottom guard plate <NUM> and the frame <NUM> may be implemented.

Moreover, the edge region of the bottom heat exchange plate is in direct contact with the frame, and the bent portion is in direct contact with at least part of the edge region of the bottom heat exchange plate, so the contact between the bottom guard plate and the bottom heat exchange plate may be regarded as surface contact. When configuring the second fastener, with the fixation of the second fastener, the bottom guard plate and the frame press the bottom heat exchange plate respectively, and such pressing is surface pressing. As the stress of the surface pressing gradually increases, the bottom heat exchange plate may be stably fixed between the frame and the bottom guard plate, thereby forming a surface fixing. In combination with the point fixing formed when the frame and the bottom heat exchange plate are fixed by the first fastener, under the dual action of point fixing and surface fixing, the bottom heat exchange plate may be effectively fixed, the sealant and the first seal strip may be compressed more evenly when the sealant and the first seal are disposed between the bottom heat exchange plate and the frame, the adhesiveness of the sealant is favorable, and the sealing performance between the sealant and the first sealing strip is also more reliable, thereby improving the sealing effect.

In some embodiments, as shown in <FIG>, for the bent portion <NUM>, the bent portion <NUM> may have a concave portion 11a. The concave portion 11a is disposed at the configuration position of the first fastener <NUM> for avoiding the first fastener <NUM>, so that an end of the first fastener <NUM> may be located in the concave portion 11a. Accordingly, the contact effect of the bent portion <NUM> and the edge region Qc of the bottom heat exchange plate <NUM> may be prevented from being affected by a certain thickness of the end of the first fastener <NUM>. The effective contact between a region, other than the concave portion 11a and the region where the second fastener (not shown in <FIG>) is disposed on the bent portion <NUM>, and the edge region Qc of the bottom heat exchange plate <NUM> may be implemented.

In some embodiments, the specific form of the concave portion is not limited to that shown in <FIG>. The concave portion may also be configured as follows. One side surface of the concave portion facing the first fastener is concave, and one side surface of the concave portion away from the first fastener is protruding.

In some embodiments, as shown in <FIG>, an inner space may be formed by the frame <NUM> and the bottom heat exchange plate <NUM>, and batteries (not shown in the drawing) may be disposed in the inner space.

Meanwhile, as shown in <FIG> and <FIG>, each bottom surface of the frame <NUM> is connected to the bottom heat exchange plate <NUM>, and the groove <NUM> and a protrusion (not shown in the drawing) opposite to the groove <NUM> are disposed on the bottom heat exchange plate <NUM>. Meanwhile, the first sealing strip <NUM> is located in the groove <NUM>, and the second sealing strip (not shown in the drawing) is disposed on the protrusion.

Both the groove <NUM> and the protrusion <NUM> may be disposed around and along the frame <NUM>, and the first sealing strip <NUM> and the second sealing strip <NUM> may also be disposed around and along the frame <NUM> (although only part of the first sealing strip <NUM> is shown in the drawing, but this does not mean that the first sealing strip <NUM> may be disposed only in the position shown in the drawing). Therefore, the effective sealing of the connection between the bottom heat exchange plate <NUM> and the frame <NUM> and the effective sealing of the connection between the bottom heat exchange plate <NUM> and the bottom guard plate <NUM> may be implemented.

In the subsequent paragraphs, with reference to specific embodiments, an air tightness test is performed to test the sealing effect of the battery pack shell provided by the embodiments of the invention.

Before the test, the battery pack shell illustrated in the foregoing paragraphs is applied to the battery pack, and then the test is performed on the battery pack.

The battery pack is inflated, the inflation pressure is <NUM>. 5KPa, the pressure is maintained at <NUM>. 5KPa, and the pressure holding time is <NUM>. The timing starts when the pressure holding time ends, and the pressure in the battery pack is tested when the timing reaches <NUM>.

The test temperature is <NUM>, and the humidity is <NUM>%. Before the test, the battery pack is required to be set aside in the test environment for <NUM> hours or more; if it requires to repeat the test, the interval between each test time is <NUM> mins or more. During testing, perceptible airflow around the battery pack is excluded.

The results of tests on the first distance and the second distance are shown in Table <NUM>. d2 represents the second distance between the edge of the first sealing strip facing the first fastener and the center of any first fastener, d1 represents the first distance between the center of the adjacent first fasteners and the center of the second fastener. p represents the amount of leakage.

According to Table <NUM>, conclusions are illustrated as follow.

In embodiment <NUM> to embodiment <NUM>, the leakage of the battery pack is between <NUM>. 0Kpa and <NUM>. 7Kpa when d2 is <NUM> to <NUM>, d1 is <NUM> to <NUM>, and d2×d1 is <NUM><NUM> to <NUM><NUM>. In comparative example <NUM> and comparative example <NUM>, when d2, d1, and d2×d1 are larger or smaller, the leakage amount of the battery pack is at least <NUM>. The leakage amount increases significantly compared to the foregoing embodiments, and this means that the sealing effect of the battery pack may be effectively improved when d2, d1, and d2×d1 are set in an appropriate range.

In addition, according to the first distance and the second distance, tests are further performed, and the test results are shown in Table <NUM>. d2 represents the second distance between the edge of the first sealing strip facing the first fastener and the center of any first fastener, d1 represents the first distance between the center of the adjacent first fasteners and the center of the second fastener, P represents the leakage amount.

According to Table <NUM>, conclusions are illustrated as follows.

By comparing embodiment <NUM> to embodiment <NUM>, the leakage of the battery pack is between <NUM>. 1Kpa and <NUM>. 1Kpa when d2 is <NUM> to <NUM>, d1 is <NUM> to <NUM>, and d2×d1 is <NUM><NUM> to <NUM><NUM>. This shows that by further setting the first distance, the second distance, and the product of the first distance and the second distance, the leakage of the battery pack may be further reduced, that is, the sealing effect of the battery pack shell may be further improved.

The results of tests on the third distance and the fourth distance are shown in Table <NUM>. d3 represents the third distance between the edge of the second sealing strip facing the second fastener and the center of any second fastener, d4 represents the fourth distance between the centers of two adjacent second fasteners, and P represents the amount of leakage.

In Embodiment <NUM> to Embodiment <NUM>, when d4 is <NUM> to <NUM>, d3 is <NUM> to <NUM>, and d4×d3 is <NUM><NUM> to <NUM><NUM>, the leakage amount of the battery pack is between <NUM>. 4Kpa and <NUM>. In Comparative Example <NUM> and Comparative Example <NUM>, when d4, d3, and d4×d3 are larger or smaller, the leakage amount of the battery pack is at least <NUM>. 7Kpa, the leakage amount increases significantly compared to the previous embodiments, it shows that by setting d4, d3, and d4×d3 in a suitable range, the sealing effect of the battery pack may be effectively improved.

In some embodiments, the bottom heat exchange plate may be, but is not limited to, a liquid cooling plate.

In some embodiments, in addition to the foregoing structures, the battery pack shell may also include other structures for implementing the function of the battery pack shell, which may be set according to actual requirements, which is not limited herein.

Based on the same inventive concept, the embodiments of the invention provide a battery pack, as shown in <FIG>, which may include the battery pack shell <NUM> as provided in the embodiments of the invention, and a battery <NUM> disposed in the battery pack shell <NUM>.

In some embodiments, as shown in <FIG>, at least one battery pack <NUM> or battery module (not shown) may be disposed in the battery pack shell <NUM>, and each battery pack <NUM> or battery module may include multiple batteries <NUM>.

The number of batteries configured is not limited to that shown in <FIG>. Specifically, the number of batteries configured may be set according to actual requirements, which is not limited herein.

In addition, the electrical connection relationship of every battery may be set as series connection, parallel connection or series-parallel connection according to actual requirements, which is not limited herein.

In some embodiments, in addition to the battery, other structures that may be disposed in the battery pack shell to implement the function of the battery pack. For example, but not limited to, a battery management system, a high-voltage power distribution box, and the like. The specific configuration may be according to actual requirements, which is not limited herein.

Claim 1:
A battery pack shell (<NUM>), comprising a bottom guard plate (<NUM>), a bottom heat exchange plate (<NUM>) and a frame (<NUM>) disposed on the bottom guard plate (<NUM>) in sequence;
wherein a first sealing strip (<NUM>) is disposed between the bottom heat exchange plate (<NUM>) and the frame (<NUM>), and the first sealing strip (<NUM>) is configured to seal a connection between the bottom heat exchange plate (<NUM>) and the frame (<NUM>); the bottom heat exchange plate (<NUM>) and the frame (<NUM>) are fixed by a first fastener (<NUM>), the bottom guard plate (<NUM>) and the frame (<NUM>) are fixed by a second fastener (<NUM>), and the bottom heat exchange plate (<NUM>) is sandwiched between the bottom guard plate (<NUM>) and the frame (<NUM>); a number of the first fasteners (<NUM>) and a number of the second fasteners (<NUM>) are plural, and each of the first fasteners (<NUM>) and each of the second fasteners (<NUM>) are disposed around and along the frame (<NUM>) into a circle;
wherein the battery pack shell (<NUM>) is characterized in that
a first distance between a center of any adjacent first fasteners (<NUM>) and a center of the second fastener (<NUM>) is <NUM> to <NUM>, a distance between an edge of the first sealing strip (<NUM>) facing the first fastener (<NUM>) and a center of any one of the first fasteners (<NUM>) is a second distance, and a product of the first distance and the second distance is <NUM><NUM> to <NUM><NUM>.