Connecting pole for rechargeable battery and rechargeable battery housing

Abstract

The invention relates to a connecting electrode (1) for a rechargeable battery, wherein the connecting electrode (1) has a connecting region (2) for fixing a terminal terminal to the connecting electrode (1) and a fixing region (3) for fixing the connecting electrode (1) to a housing part (5) of the rechargeable battery. A circumferential projection (14) is provided in the end region of the fixing region (3) facing the connecting region (2), said projection having an at least substantially annular shape and provided with a tooth system on its outer circumference to prevent the connecting electrode (1) from rotating. In order to achieve a situation in which no capillary gaps or gaps in the pm range occur between the connecting electrode (1) and the material of the battery cover when the connecting electrode (1) is pressed or injection-molded into the battery cover of the rechargeable battery, according to the invention, a circumferential sealing projection (19) is provided in the end region of the fixing region (3) facing the connecting region (2), between the circumferential projection (14) provided with the tooth system and the connecting region (2), said sealing projection having an at least substantially annular shape.

Description

[0001] The present invention relates to a connecting pole for a rechargeable battery and a rechargeable battery housing. The present invention also relates to a plastic battery cover for closing the battery housing, which has a lower side facing the interior of the battery housing when mounted on the battery housing and an opposite upper side, and has at least one metal connecting pole extending through the battery cover. The present invention also relates to a lead-acid battery having a plastic housing divided into cells, a plurality of electrode plates in compartments of the plastic housing, and an electrolyte in the cells.

[0002] In battery production, particularly rechargeable batteries, and in this context, especially starter batteries, creating and maintaining a sealed feedthrough, such as for pole connections and cell connectors, presents a particular challenge. The feedthroughs must be inexpensive and easy to manufacture and must withstand the electrolyte, which is very susceptible to creep. For this purpose, lead bushings are often pressed or molded into the battery cover or cell wall as pole feedthroughs.

[0003] Despite the different coefficients of thermal expansion of metal and plastic, a secure mounting must be ensured. This problem is exacerbated by other problems caused by the presence of acid in and during battery production.

[0004] Previously used connecting poles typically consist of lead sleeves that are cold-rolled, cast in a mold, or injection-molded. Protrusions and a labyrinth provide the necessary safety features to prevent twisting or anchor the cover against removal. Furthermore, the goal of improving sealing by extending the creep distance of the electrolyte is achieved by using a greater or lesser number of labyrinth turns.

[0005] WO 2014 / 198650 A1 discloses a pole lead-through of this type, for example in the form of a lead sleeve with a labyrinth, wherein an anti-rotation protection device is further provided.

[0006] However, in practice, it has been found that even with such pole sleeves as are known from the prior art, it is not possible to prevent the formation of gaps in the μm range between the pole sleeve and the cell cover to a locally limited extent, into which acid penetrates during the cell manufacturing process and remains in these gaps despite the best efforts at cleaning. Over time, this can lead to known deterioration phenomena due to corrosion.

[0007] For this purpose, in the prior art, it is essential to improve the seal by coating the outer surface of the connecting pole with silicone grease or bitumen, for example. This creates a lubricant seal that simultaneously protects the lead bushing from corrosion.

[0008] However, this type of seal reduces the secure installation of the lead bushing. Furthermore, the processing of such a lead bushing is complicated, and the mold is also contaminated. Due to the detachment of the coating portion, defects such as cracks may occur in the surrounding material.

[0009] Even treatment of the connecting pole surface by sandblasting or some other roughening method has not so far led to any significant improvements.

[0010] Based on this problem, the underlying object of the present invention is to develop a connecting electrode, for example of the type known from WO 2014 / 198650 A1, in such a way that, when the connecting electrode is pressed or molded into the battery cover, no capillary gaps or gaps in the μm range arise between the connecting electrode and the material of the battery cover, in which gaps acids or electrolytes could collect or could pass through, so that in this way the connecting electrode can be effectively protected from corrosion even without the use of lubricant sealing.

[0011] Another object of the present invention is to provide a corresponding plastic battery cover or a corresponding battery housing and a lead-acid battery.

[0012] With regard to the connecting pole, the object on which the invention is based is achieved by the subject matter of independent patent claim 1. Advantageous developments of the connecting pole according to the invention are specified in dependent patent claims 1 to 27.

[0013] The present invention therefore relates in particular to a connecting pole for a rechargeable battery, wherein the connecting pole has a connecting region for fastening a pole terminal to the connecting pole and a fastening region for fastening the connecting pole to a housing part of the rechargeable battery.

[0014] The term "connection region" as used herein should be understood to mean, in the mounted state of the connecting pole, i.e. when the connecting pole has been pressed or molded into the battery cover or into the housing part of the rechargeable battery, the region of the connecting pole which is respectively exposed towards the outside in order to allow the attachment of a terminal terminal.

[0015] In contrast, the term “fastening region” in this context should be understood to mean that region of the connecting pole which, in the mounted state of the connecting pole, is pressed or molded into the material of the housing part of the rechargeable battery.

[0016] Similar to the connecting pole known from WO 2014 / 198650 A1, the connecting pole according to the invention has a corresponding anti-rotational protection in its fastening region, which is formed by a circumferential projection having a substantially annular shape and provided with a tooth system on its outer circumference. The anti-rotational protection (torque ring) is arranged in the end region of the fastening region, which faces the connecting region of the connecting pole.

[0017] The connecting pole according to the invention is characterized in particular in that in the installed state, i.e. when the connecting pole has been pressed or molded into place to pass through the corresponding pole lead-through in the housing part of the rechargeable battery, no capillary gaps or other gaps in the μm range remain or exist between the components of the connecting pole and the material of the housing part, in which gaps acid or electrolyte could collect or through which acid or electrolyte could escape, so that a leak-proof seal between the connecting pole and the housing part of the rechargeable battery is ensured even without additional sealing devices.

[0018] For this purpose, it is contemplated that, in the case of the connecting pole according to the invention, an additional circumferential sealing projection is provided in the end region of the fastening region facing the connecting region, more specifically between the rotational protection and the connecting region, i.e., between the circumferential projection provided with the tooth system and the connecting region. This additional projection has an at least substantially annular design and serves as a sealing projection. The provision of this circumferential sealing projection of at least substantially annular design above the rotational protection (i.e., in the region between the rotational protection and the connecting region of the connecting pole) allows for the purpose of ensuring that no capillary gaps or other gaps in the μm range remain or are present between components of the connecting pole and the material of the housing part. More specifically, it has been found that the provision of this sealing projection effectively prevents the formation of capillary gaps or other gaps between components of the connecting pole and the material of the housing part of the rechargeable battery.

[0019] According to an embodiment of the connecting electrode according to the present invention, it is envisaged that the sealing projection provided between the anti-rotation protection device and the connecting region of the connecting electrode has an outer peripheral surface, in particular an annular peripheral surface, which is formed without a tooth system. This measure ensures that, in particular, when the connecting electrode according to the present invention is fixed to the housing part of the rechargeable battery, i.e., when the connecting electrode has been pressed or molded into the housing part in the corresponding pole lead-through, the sealing projection is completely covered by the material of the housing part (in particular, plastic material). This also applies in particular to the upper annular surface of the annular projection, which faces the connecting region of the connecting electrode. Since the upper annular surface of the annular projection is also completely covered by the material of the housing part (in particular, plastic material) when the connecting electrode has been pressed or molded into the housing part of the rechargeable battery, the formation of gap regions or capillary gaps in which electrolyte or acid may remain or through which electrolyte may escape can be effectively prevented.

[0020] In a preferred embodiment of the most recently mentioned embodiment, it is envisaged that the upper annular surface of the sealing projection lies in a plane which is in or below a cross-sectional plane between the connection area and the fixing area, wherein (as already stated at the outset) the connection area defines the area of the connecting pole which is exposed relative to the housing part when the connecting pole is connected to the housing part of the rechargeable battery.

[0021] According to a first alternative embodiment of the connecting pole according to the invention, it is envisaged that the sealing projection has a lower annular surface facing away from the connection area, which lower annular surface is located in a plane corresponding to the plane in which the upper annular surface of the circumferential projection (anti-rotation protection device) provided with the tooth system is located.

[0022] However, a more effective seal can be achieved between the connecting pole and the housing part of the rechargeable battery if the lower annular surface of the sealing projection lies in a plane which extends parallel to and at a distance from the plane in which the upper annular surface of the circumferential projection provided with the tooth system lies.

[0023] In this context, it has proven to be particularly effective if a circular undercut region is provided between the circumferential projection provided with the tooth system (anti-rotation protection) and the sealing projection.

[0024] According to an embodiment of the connecting pole according to the invention, the undercut region has a length of 0.1 to 0.8 mm, preferably 0.2 to 0.7 mm and even more preferably 0.3 to 0.5 mm, when viewed in the longitudinal direction of the connecting pole.

[0025] For better performance with highly creep-sensitive electrolytes, an embodiment of the connecting pole according to the invention provides that the sealing projection has a peripheral surface which is preferably inclined in the direction of the peripheral projection (anti-rotation protection) provided with the tooth system.

[0026] With regard to the anti-rotation protection of the connecting pole according to the invention, it is envisaged that the toothing of the circumferential projection has a toothing in which, when viewed in the circumferential direction of the projection, preferably regular radial projection areas are formed. In this respect, according to various aspects of the invention, it is envisaged that, when viewed in the radial direction of the connecting pole, the radial projection areas of the toothing project at least as far, and preferably further, than the sealing projection.

[0027] Between each two adjacent radially projecting areas of the toothing there is a grooved area of the toothing which, when viewed in the radial direction of the connecting pole, does not project as far as the projecting areas of the toothing. With regard to these grooved areas of the toothing, it is envisaged that the rounded projection preferably projects further than the respective grooved area of the toothing.

[0028] According to an embodiment of the connecting pole according to the invention, the connecting pole comprises a labyrinth region in its fastening region, and preferably in the region of the end of the fastening region opposite the connecting region, wherein the outer wall of the connecting pole comprises at least one circumferential projection in the labyrinth region. In this case, it is advantageous if the circumference of the outer wall of the connecting pole increases in the direction away from the connecting region in at least one region of the labyrinth region in which no circumferential projection is provided.

[0029] This makes it possible to achieve a smaller outer circumference of the connecting pole close to the connection region (ie in the upper region of the labyrinth region), thereby making it possible to reduce the amount of material required for the connecting pole in this region.

[0030] Therefore, those wall areas in which no circumferential projections are arranged, completely or partially, are considered to be the periphery of the outer wall of the connecting pole in the areas of the labyrinth region in which no circumferential projections are arranged. These are therefore wall areas of the outer wall in which no transition to a circumferential projection is also arranged.

[0031] For the recently mentioned embodiment of the invention, the outer circumference can therefore decrease starting from the lower end of the connecting pole towards the connection region. Thus, for example, it is conceivable that, outside the at least one circumferential projection, in at least one region of the labyrinth region, the outer wall of the connecting pole increases conically in the direction away from the connection region. Thus, outside the at least one circumferential projection, in at least one region of the labyrinth region, the outer circumference of the connecting pole increases in an approximately linear manner in the direction away from the connection region.

[0032] As described above, this embodiment of the connecting electrode advantageously allows for material savings in the upper region of the labyrinth. At the same time, sufficient mechanical stability of the connecting electrode can be further ensured. The reduction in material used for the connecting electrode, which is made of, for example, lead, leads to a significant reduction in the weight of the connecting electrode and, therefore, also the weight of the rechargeable battery housing in which the connecting electrode is provided. This material savings is also advantageously associated with cost savings.

[0033] The outer wall of the connecting pole advantageously extends in at least one region, more particularly in a region in which one or more circumferential projections are not arranged, in the form of a single-lobed hyperboloid or conically.

[0034] According to an embodiment of the connecting pole according to the invention, the diameter of at least one circumferential projection arranged in the labyrinth region is also reduced. This further saves material and weight. It is also possible to provide multiple circumferential projections.

[0035] According to an advantageous development of the invention, it is conceivable that in the region where no circumferential projection is provided, the circumference of the outer wall of the connecting pole increases in the direction away from the connection region over the entire labyrinth region. This allows for a maximum saving of material and thus a reduction in weight.

[0036] According to an advantageous development of the invention, the labyrinth region has a shorter extent in the longitudinal direction of the connecting pole than the fastening section. This allows additional elements to be arranged in the fastening section without impairing the labyrinth region.

[0037] The at least one circumferential projection of the labyrinth region can be implemented with various profiles. A ring shape can be mentioned as the basic shape for the circumferential projection. According to an advantageous development of the invention, at least one circumferential projection has a hook-shaped profile. The hook region of this profile can follow the outer side of a projection shaped, for example, in the manner of a ring according to the aforementioned basic shape. The hook-shaped profile effectively supports the formation of the labyrinth between the material of the connecting pole and the plastic of the surrounding housing. This further enhances the sealing effect of the labyrinth.

[0038] According to a preferred development of the present invention, the connecting pole is hollow internally. In at least one first region of the labyrinth area, the periphery of the inner wall of the connecting pole increases in a direction away from the connection region. In a preferred development of the present invention, the region of the inner wall that increases in terms of its periphery can be designed to overlap the region of the outer wall that increases in terms of its periphery. According to a preferred development of the present invention, the inner and outer walls of the connecting pole extend parallel to each other in their longitudinal direction, at least in a certain section or sections. Thus, a constant wall thickness can be achieved in the longitudinal direction of the connecting pole, at least in a certain section or sections. In short, the connecting pole can thus be further optimized in terms of material savings and weight. For example, this development can be achieved if the angle formed by the conical region of the inner wall relative to the longitudinal axis of the connecting pole is substantially equal to the angle formed by the conical section of the outer wall relative to the longitudinal axis of the connecting pole.

[0039] According to an advantageous development of the invention, it is envisaged that the first region of increased circumference of the inner wall does not protrude beyond the region of increased circumference of the outer wall in the longitudinal direction of the connecting pole. In particular, the first region of increased circumference of the inner wall can be arranged to extend as far as the connecting region.

[0040] According to an advantageous development of the invention, it is provided that the first region of the inner wall with an increased circumference projects beyond the region of the outer wall with an increased circumference in the longitudinal direction of the connecting pole. This allows the provision of other specially shaped sections of the inner wall.

[0041] According to an advantageous development of the invention, it is provided that the connecting pole is hollow on the inside and that the circumference of the inner wall of the connecting pole increases in the connection region in the direction of the labyrinth region.

[0042] According to an advantageous development of the invention, it is envisaged that the perimeter of the inner and / or outer wall increases in a monotonically linear or arcuate manner. Thus, the perimeter can increase in a linear profile, with the result that the inner and / or outer wall extends conically at least in a certain section or sections. An arcuate profile, for example, having a hyperbolic shape, can also be advantageously provided. It is also advantageous to provide a combination of conical and arcuate sections on the inner and / or outer wall at the connecting pole.

[0043] In particular, the connecting pole can be of rotationally symmetrical design.In this case, the aforementioned statements about the periphery of the inner wall or outer wall relate to their respective diameter.

[0044] According to an advantageous development of the invention, the inner wall of the connecting pole increases conically in at least one second area of the labyrinth area in a direction away from the connecting area. In the second area, the inner wall forms a larger angle with respect to the longitudinal axis of the connecting pole than in the first area. This gradual increase in the cone angle allows a progressive centering effect to be provided for the inner area of the connecting pole during assembly of the rechargeable battery. The inner hollow area of the connecting pole is provided for receiving a connecting pin, which extends through the connecting pole into the interior of the connecting section. The connecting pin is connected to the electrode plate group inside the rechargeable battery. In the context of manufacturing a rechargeable battery in this way, the bottom of the housing is first provided with an electrode plate group, to which the connecting pin is already mounted.

[0045] The rechargeable battery cover, into which the connecting poles are injection-molded, is then placed on the housing base. In this case, simple and rapid centering of the connecting poles relative to the connecting pins is crucial for rapid and efficient production of rechargeable batteries. The conical inner section simplifies this centering.

[0046] Another advantage is that during the production of the cover for the rechargeable battery, the lower mandrel for internal sealing of the injection-molded material from the environment can be quickly positioned in the second conical region.

[0047] According to an advantageous development of the invention, the second region is on a side of the first section facing away from the connecting region.

[0048] According to an advantageous development of the invention, the circumference of the inner wall of the connecting pole changes discontinuously at the end of the connecting pole facing away from the connection region. This discontinuity results in an abrupt change in the inner diameter. Thus, for example, an annular end section of the connecting pole with an increased diameter relative to the first or second region can be achieved.

[0049] Advantageously, the rechargeable battery housing or a portion thereof comprises at least one connecting electrode of the aforementioned type. The fixing section of the at least one connecting electrode is advantageously embedded into the housing portion of the rechargeable battery by injection molding. For example, the housing portion of the rechargeable battery can be a cover of the rechargeable battery.

[0050] Exemplary embodiments of a connecting pole according to the invention are described in more detail below with reference to the accompanying drawings.

[0051] In the attached figure:

[0052] Figure 1a 、 1b Each shows an isometric view of a first exemplary embodiment of a connecting pole according to the invention;

[0053] Figure 2 schematically shows a side view of a connecting pole according to a first exemplary embodiment;

[0054] Figure 3 shows schematically a longitudinal section through a connecting pole according to a first exemplary embodiment;

[0055] Figure 4 schematically shows a side view of a variant of the connecting pole according to the first exemplary embodiment;

[0056] Figure 5 Schematically shows the Figure 4 A longitudinal section through a variant of the connecting pole shown;

[0057] Figure 6 shows an isometric view of a second exemplary embodiment of a connecting pole according to the invention;

[0058] Figure 7 schematically shows a side view of a connecting pole according to a second exemplary embodiment; and

[0059] Figure 8 A longitudinal section through a connecting pole according to a second exemplary embodiment is schematically shown.

[0060] In the drawings, the same reference numerals are used for corresponding elements and components.

[0061] The connecting pole 1 according to the present invention is described below with reference to the accompanying drawings of exemplary embodiments. More specifically, Figure 1a and 1b A first exemplary embodiment of a connecting pole 1 according to the invention is shown in each case in an isometric view, which is again schematically shown in a side view. Figure 2 and schematically in longitudinal section. Figure 3 Shown in.

[0062] Figure 4A modification of the connecting pole 1 according to the first exemplary embodiment is schematically shown in a side view. Figure 5 Here again it is shown schematically in longitudinal section.

[0063] The connecting pole 1 according to the first exemplary embodiment has a connection region 2 and a fastening region 3. Furthermore, a labyrinth region 4 is provided.

[0064] In the connection region 2, on its outer side, the connecting pole 1 has an outer wall 18 and an upper end surface 16. A circumferential projection 14 is arranged on the outer side of the connecting pole 1. In the fixing region 3 adjoining the connection region 2, the circumferential projection 14 can essentially have an approximately annular shape and serve as an anti-rotational protection device. To this end, the circumferential projection 14 has a tooth system on its outer periphery, which is described in more detail below. The outer wall 6 on the outer side of the connecting pole 1 adjoins the circumferential projection 14 (anti-rotational protection device), which wall is arranged in the labyrinth region 4. The outer wall 6 is interrupted by circumferential projections 7, 8, each of which has a hook-shaped profile. In addition to the tooth system, the connecting pole 1 can also be designed as a substantially rotationally symmetrical component, for example.

[0065] In the left-hand region of the connecting pole 1 as an example, Figure 2 A fragment of a rechargeable battery housing part 5 is shown, which is molded onto a connecting pole 1 by injection molding. It is clear that in the fastening region 3, the connecting pole 1 is embedded on its outer side in the material of the housing part 5. The circumferential projections 7, 8, 14 form a labyrinth that ensures good sealing of the interior of the rechargeable battery from the environment.

[0066] The connecting pole 1 is hollow. Within the cavity 17 formed in the connecting pole 1, sections of the inner wall 9 extend conically at different angles relative to the longitudinal axis L of the connecting pole 1. In the labyrinth region 4, a second region 11 and a first region 10 of the conically extending inner wall 9 are shown. The second region 11 adjoins the first region 10, which is located on the side of the connecting pole 1 opposite the connecting region 2. A further conically extending region 15 of the inner wall 9 is provided on the other side of the first region 10, extending from an upper end surface 16 into the labyrinth region.

[0067] Adjoining the second region 11 is an approximately annular region 13 in the cavity 17. In this case, the diameter of the cavity 17 increases abruptly at the location indicated by reference numeral "12".

[0068] The circumferential projection 14, serving as a rotational protection, has an external toothing system formed by corresponding radially projecting areas 21 (teeth). A grooved area 22 is located between each two adjacent radially projecting areas 21 (teeth) of the toothing. The toothing formed by the radially projecting areas 21 and the grooved areas 22 provides rotational protection for the connecting pole 1 in the plastic material of the rechargeable battery housing part 5.

[0069] In the exemplary embodiment of the connecting pole according to the invention shown in the drawings, a plurality of radially protruding areas 21 (teeth) are provided, which are arranged in a manner evenly distributed over the circumference of the connecting pole 1. In this case, the radially protruding areas 21 are advantageously provided with asymmetrical tooth flanks. Figure 1a and Figure 1b As can be seen from the isometric illustration in FIG, the first tooth flank of the radially projecting region 21 has a smaller angle relative to the outer periphery of the circumferential projection 14 than the second tooth flank belonging to the radially projecting region 21. The flanks formed at a smaller angle make it possible to produce the connecting pole 1 using a clamp-type mold. However, during demoulding, the clamp can be easily separated from the connecting pole 1 because no undercut is formed in the separation direction.

[0070] A first exemplary embodiment of a connecting pole 1 according to the invention is shown in the drawing and in Figure 4 and Figure 5 The modified embodiment shown in FIG is characterized in particular by an additional circumferential projection 19 of at least substantially annular design, which is arranged between the circumferential projection 14, which is provided with a tooth system and serves as a rotational protection, and the connection region 2 in the end region of the fastening region 3 facing the connection region 2 of the connection pole 1. This additional circumferential projection 19 serves to effectively prevent the formation of any gap between the connection pole 1 and the material of the housing part of the rechargeable battery, in order to thereby allow acid to remain in the gap and, in particular, also to allow a highly effective, leak-proof seal.

[0071] from Figure 2As can be seen from the illustration in FIG, the sealing projection 19 is arranged and embodied such that, when the connecting pole 1 is fixed to the housing part 5 of the rechargeable battery, the sealing projection 19 is preferably covered over the entire area by the material of the housing part 5 (particularly the plastic material). In this context, "covered over the entire area" means that, in particular, the upper annular surface of the sealing projection 19, which faces the connection region 2 of the connecting pole 1, is also covered by the material of the housing part 5 (particularly the plastic material). To this extent, the upper annular surface of the annular sealing projection 19 lies in a plane that is in or below the cross-sectional plane between the connection region 2 and the fixing region 3, wherein the connection region 2 defines the area of the connecting pole 1 that is exposed relative to the housing part 5 when the connecting pole 1 is connected to the housing part 5 of the rechargeable battery.

[0072] In the exemplary embodiment of the connecting pole 1 according to the invention shown in the drawings, the annular sealing projection has an outer circumferential surface which is in particular annular and is preferably formed without a tooth system, since in the shown exemplary embodiment of the connecting pole 1 according to the invention, the sealing projection 19 has only the function of a reliable seal and not a protective function against rotation.

[0073] It can also be seen from the figures that the circumferential projection 14 provided with the tooth system (anti-rotation protection device) has an upper annular surface facing the sealing projection 19, which is located in a plane extending parallel to the plane of the upper annular surface of the annular sealing projection 19.

[0074] In a first exemplary embodiment of a connecting pole 1 according to the invention, as shown in FIG. Figure 5 In the variant shown in the accompanying drawings, the annular sealing projection 19 has a lower annular surface that faces the connection region 2 of the connecting pole 1 and lies in a plane that extends parallel to and at a distance from the plane of the upper annular surface of the circumferential projection 14 provided with the tooth system. However, the annular sealing projection 19 directly adjoins the circumferential projection 14 provided with the tooth system. In other words, no additional projection is provided between the sealing projection 19 and the projection 14.

[0075] Specifically, from Figure 2 、 3 , 4 and 5 , it can be seen that an annular undercut area 20 is provided between the sealing projection 19 and the projection 14 .

[0076] When viewed in the radial direction of the connecting pole 1, a leak-proof seal can be achieved in an effective manner, in particular when the circular sealing projection 19 projects further than the respective groove-shaped region 22 of the toothing of the projection 14. However, in this case, the circular sealing projection 19 does not necessarily have to project further in the radial direction than the radially projecting region of the toothing of the projection 14.

[0077] Figure 3 The preferred dimensions of the diameter and length of the connecting pole 1 input in are as follows:

[0078] D1:21-22mm L1:18.35-20.35mm L4:0.2-0.4mm D2:20-22mm L2:15.85-17.58mmL5:0.4-2.4mm D3:19-21mm L3:0.7-0.9mm L6:1.5-3.5mm

[0079] Figure 5 The preferred dimensions of the diameter and length of the connecting pole 1 input in are as follows:

[0080] D1:21-22mm L1:18.35-20.35mm L4:0.2-0.4mm D2:19-21mm L2:15.85-17.58mmL5:0.4-2.4mm D3:18-20mm L3:0.7-0.9mm L6:1.5-3.5mm

[0081] Figure 6 An isometric view of a second exemplary embodiment of a connecting pole 1 according to the invention is shown. Figure 7 is shown schematically in side view in FIG, and again in Figure 8 It is schematically shown in longitudinal section.

[0082] Structurally and functionally, connecting pole 1 essentially corresponds to the connecting pole according to the first exemplary embodiment, so to avoid unnecessary repetition, only the differences between the two exemplary embodiments will be discussed below. More specifically, in the case of connecting pole 1 according to the second exemplary embodiment, it is conceivable that, unlike the first exemplary embodiment, annular sealing projection 19 has a lower annular surface facing away from connection region 2, which lies in a plane corresponding to the plane in which the upper annular surface of circumferential projection 14, which is provided with the tooth system, also lies. In other words, in the second exemplary embodiment of connecting pole 1 according to the invention, no undercut is provided between sealing projection 19 and projection 14 serving as anti-rotation protection.

[0083] Figure 8 The preferred dimensions of the diameter and length of the connecting pole 1 input in are as follows:

[0084] D1:22-24mm L1:18.35-20.35mm L3:0.4-0.6mm D2:19-21mm L2:15.85-17.58mmL6:1.5-3.5mm

[0085] The aforementioned embodiments of the connecting pole 1 each have a linear profile in the longitudinal direction, i.e., a corresponding conical section or region. However, embodiments of the connecting pole 1 in which the inner wall 9 and the outer wall 6 are arcuate in the fixing region 3 are also conceivable in this context.

[0086] The invention is not limited to the exemplary embodiments shown in the drawings, but can be obtained from the combination of all features disclosed herein.

[0087] Reference Signs List

[0088] 1 connection pole

[0089] 2 connection area

[0090] 3 fixed areas

[0091] 4 maze areas

[0092] 5 Housing portion of rechargeable battery

[0093] 6 The outer wall of the connecting pole in the fixing area

[0094] 7 Circumferential protrusion (maze area)

[0095] 8 Circumferential protrusions (maze area)

[0096] 9Inner wall of the connecting pole

[0097] 10 The first section of the inner wall in the maze area

[0098] 11 The second section of the inner wall in the maze area

[0099] 12 positions

[0100] 13 annular region in the lower end region of the cavity

[0101] 14 protrusions / anti-rotation protection

[0102] 15 The third section of the inner wall

[0103] 16 Upper connection surface

[0104] 17 Cavity

[0105] 18 The outer wall of the connecting pole in the connection area

[0106] 19 sealing protrusion

[0107] 20 Undercut area

[0108] 21 radially protruding areas / teeth

[0109] 22 trough area

[0110] L connecting pole longitudinal axis

[0111] The length of the area indicated by L1 to L6

[0112] The diameter of the area indicated by D1 to D3

Claims

1. A rechargeable battery housing comprising a connecting pole (1) and a housing part (5), wherein the connecting pole (1) has the following: - a connection region (2) for fixing the terminal connection to the connecting pole (1); and a fastening region (3), in which the connecting pole (1) is fastened to the housing part (5), wherein a circumferential projection (14) is provided in the end region of the fixing region (3) facing the connection region (2), the circumferential projection (14) having at least an annular shape and provided with a tooth system on its outer circumference to prevent the connection pole (1) from rotating, The connecting pole is characterized by In the end region of the fastening region (3) facing the connecting region (2), a circumferential sealing projection (19) is provided between the circumferential projection (14) provided with the tooth system and the connecting region (2), the circumferential sealing projection having at least annular design, wherein no additional projections are provided between the circumferential projection (14) provided with the tooth system and the connecting region (2), wherein the circumferential sealing projection (19) has an upper annular surface which faces the connection region (2) and is covered over the entire area by the material of the housing part (5) when the connecting pole (1) is fixed to the housing part (5), wherein the circumferential sealing projection (19) has a lower annular surface facing away from the connection region (2), the lower annular surface being located in a plane parallel to and at a distance from the plane in which the upper annular surface of the circumferential projection (14) on which the tooth system is provided lies, wherein a circular undercut region (20) is provided between the circumferential protrusion (14) provided with the tooth system and the circumferential sealing protrusion (19), wherein the circumferential sealing projection (19) has an outer peripheral edge surface formed without a tooth system, The tooth system of the circumferential protrusion (14) has a toothing portion, in which, when viewed from the circumferential direction of the circumferential protrusion (14), regular radial protrusion areas (21) are formed, and a groove-shaped area (22) of the toothing portion is present between every two adjacent radial protrusion areas (21) of the toothing portion, wherein, when viewed in the radial direction of the connecting pole (1), the radially protruding area (21) of the toothing protrudes further than the circumferential sealing protrusion (19), the grooved area protrudes less far than the radially protruding area (21) of the toothing, and the circumferential sealing protrusion (19) protrudes further than the respective grooved area (22) of the toothing; and The undercut region (20) has a length of 0.3 mm to 0.5 mm when viewed in the longitudinal direction (L) of the connecting pole (1).

2. The rechargeable battery case according to claim 1, The upper annular surface of the circumferential sealing projection (19) lies in a plane below a cross-sectional plane between the connection area (2) and the fixing area (3), wherein the connection area (2) defines an area of the connecting pole (1) which is exposed relative to the housing part (5) when the connecting pole (1) is connected to the housing part (5).

3. The rechargeable battery case according to claim 2, The circumferential projection (14) in which the tooth system is arranged has an upper annular surface facing the circumferential sealing projection (19), the upper annular surface being in a plane extending parallel to the plane in which the upper annular surface of the circumferential sealing projection (19) is located.

4. The rechargeable battery case according to claim 1, in, When viewed in the longitudinal direction (L) of the connecting pole (1), the circumferential projection (14) provided with the tooth system has a first length and the circumferential sealing projection (19) has a second length, wherein the first length is greater than the second length.

5. The rechargeable battery case according to claim 4, The first length is within a range between 0.5 mm and 4.0 mm. The rechargeable battery case of claim 4 , wherein the first length is within a range between 0.8 mm and 3.0 mm. 7 . The rechargeable battery case of claim 4 , wherein the first length is within a range between 1.0 mm and 2.8 mm.

8. The rechargeable battery case according to claim 1, A labyrinth region (4) is formed in an end region of the fixing region (3) opposite the connection region (2) and remote from the connection region (2), wherein the outer wall (6) of the connecting pole (1) has at least one circumferential projection (7, 8) in the labyrinth region (4).

9. The rechargeable battery case according to claim 8, The circumference of the outer wall (6) of the connecting pole (1) increases in a direction away from the connecting region (2) in at least one region of the labyrinth region (4) where no circumferential projections (7, 8) are provided.

10. The rechargeable battery case according to claim 8, The labyrinth region (4) has a shorter extent in the longitudinal direction (L) of the connecting pole (1) than the fastening region (3).

11. The rechargeable battery case according to claim 8, The at least one circumferential projection (7, 8) of the labyrinth region (4) has a hook-shaped profile.

12. The rechargeable battery case according to claim 8, wherein the connecting pole (1) is hollow inside, and the periphery of the inner wall (9) of the connecting pole (1) increases in at least one first section of the labyrinth region (4) in a direction away from the connecting region (2), and / or The connecting pole (1) is hollow inside, a first section and a second section of an inner wall (9) extend conically at different angles of the inner wall (9) relative to the longitudinal direction (L) of the connecting pole (1), the second section adjoining the first section on the side of the connecting pole (1) opposite to the connecting region (2), and, in the second section, the inner wall (9) forms a larger angle relative to the longitudinal direction (L) of the connecting pole (1) than in the first section.

13. The rechargeable battery case according to claim 12, The inner wall (9) and the outer wall (6) of the connecting pole (1) extend parallel to the longitudinal direction (L) of the connecting pole (1) at least in a certain region or regions.

14. The rechargeable battery case according to claim 12, The first section of the inner wall (9) with an enlarged circumference does not protrude in the longitudinal direction (L) of the connecting pole (1) more than the section of the outer wall (6) with an enlarged circumference.

15. The rechargeable battery case according to claim 12, The first section of the inner wall (9) with an enlarged circumference protrudes in the longitudinal direction (L) of the connecting pole (1) beyond the section of the outer wall (6) with an enlarged circumference.

16. The rechargeable battery case according to claim 12, The connecting pole (1) is hollow inside, and the periphery of the inner wall (9) of the connecting pole (1) increases in the connection area (2) in the direction from the connection area to the labyrinth area (4).

17. The rechargeable battery case according to claim 12, The circumference of the inner wall (9) of the connecting pole (1) and / or the circumference of the outer wall (6) of the connecting pole (1) increases in a monotonically linear or arcuate manner.

18. The rechargeable battery housing according to claim 17, The arcuate enlargement of the circumference of the connecting pole (1) is gradual in the direction away from the connecting area (2).

19. The rechargeable battery housing according to claim 1 , comprising at least one connecting pole ( 1 ), wherein at least one connecting pole ( 1 ) is embedded in the housing part in its fixing region ( 3 ) by injection molding technology.

20. A rechargeable battery comprising the rechargeable battery case according to any one of claims 1 to 19.

21. A rechargeable battery housing comprising a connecting pole and a housing portion, the connecting pole having a longitudinal direction and a radial direction, and the connecting pole comprising: a connecting region, the connecting region being used to fix the terminal to the connecting pole; a fastening region, in which the connecting pole is fastened to the housing part, the fastening region having an end region facing the connecting region; The end region has a circumferential projection which has at least an annular shape and which has a tooth system on its outer circumference as a limiter for the connection pole rotation; a circumferential sealing projection having at least annular shape, which is arranged in the end region between the circumferential projection and the connecting region, wherein no additional projection is arranged between the circumferential projection provided with the tooth system and the connecting region; The upper annular surface of the circumferential sealing projection faces the connection area and is located close to the housing part in the connection area, and the upper annular surface is covered by the housing part from the external environment. wherein the circumferential sealing projection has a lower annular surface facing away from the connection region, the lower annular surface being located in a plane parallel to and extending at a distance from a plane in which the upper annular surface of the circumferential projection on which the tooth system is provided lies, and wherein a circular undercut region is provided between the circumferential protrusion provided with the tooth system and the circumferential sealing protrusion, wherein the circumferential sealing projection has an outer peripheral surface formed without a tooth system, wherein the tooth system of the circumferential protrusion has a toothing portion in which, when viewed in the circumferential direction of the circumferential protrusion, regular radially protruding areas are formed, and a groove-shaped area of the toothing portion exists between every two adjacent radially protruding areas of the toothing portion, and Therein, when viewed from the radial direction of the connecting pole, the radially protruding areas of the toothing protrude further than the circumferential sealing protrusions, and the grooved areas protrude less far than the radially protruding areas of the toothing, wherein the circumferential sealing protrusions protrude further than the respective grooved areas of the toothing. 22 . The rechargeable battery housing according to claim 21 , comprising at least one connecting pole, wherein at least one connecting pole is embedded in the housing part in its fastening region by injection molding.

23. A rechargeable battery comprising the rechargeable battery case according to any one of claims 21 to 22.

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