Lead-acid battery

Abstract

The utility model relates to a kind of lead-acid storage batteries, with shell and multiple electrode plates arranged in the shell, wherein positive electrode plate and negative electrode plate are provided, positive electrode plate and negative electrode plate are alternated with each other, and separator is respectively inserted between them, wherein the shell has base body with opening on one side and cover that closes the opening side of the base body, wherein the positive electrode plate of one side and the negative electrode plate of the other side are electrically connected to each other by unit connecting element, wherein each unit connecting element carries at least one connecting pole, wherein the connecting pole is protruded through the corresponding through hole in the cover, and the connecting pole of the positive electrode plate is received by the associated through hole, so that it can be longitudinally displaced relative to the cover.

Description

Technical Field

[0001] This utility model relates to a lead-acid battery, particularly a so-called GroE battery, which has a casing and a plurality of electrode plates arranged in the casing, wherein positive electrode plates and negative electrode plates are provided, the positive electrode plates and negative electrode plates are alternated, and corresponding separators are inserted between them. The casing has a base with an opening on one side and a cover that closes the opening side of the base. The positive electrode plate on one side and the negative electrode plate on the other side are electrically connected to each other by unit connectors, wherein each unit connector carries at least one connecting post, wherein the connecting post extends through a corresponding through hole in the cover. Background Technology

[0002] Lead-acid batteries, especially specially designed lead-acid batteries such as the so-called GroE batteries, are well known in the prior art and therefore require no separate written proof.

[0003] A typical storage battery has a casing and multiple electrode plates housed within the casing. The casing also contains an electrolyte that surrounds the electrode plates when intended for use. In the case of lead-acid batteries, sulfuric acid is used as the electrolyte.

[0004] The battery casing has a base with an opening on one side. During manufacturing, the electrode plates are inserted into the casing using this opening. During final assembly, the opening side of the casing is closed by a cap. The cap is liquid-tightly engaged with the base (particularly to prevent electrolyte leakage).

[0005] The positive electrode plate is located on one side, and the negative electrode plate is located on the other side. The positive and negative electrode plates are arranged alternately, and a partition is placed between each pair of adjacent electrode plates to prevent short circuits.

[0006] The positive electrode plates are electrically connected to each other, and the negative electrode plates are electrically connected to each other, for which unit connectors are provided. Therefore, there are a first unit connector and a second unit connector; the first unit connector connects the positive electrode plates to each other, and the second unit connector connects the negative electrode plates to each other. Each unit connector carries at least one connecting terminal. Therefore, a positive connecting terminal (so-called positive terminal) and a negative connecting terminal (so-called negative terminal) are provided. The two connecting terminals extend through corresponding through holes in the cover of the outer casing. Therefore, the connecting terminals can make electrical contact from the outside.

[0007] Each electrode plate of a lead-acid battery has a grid and active material, with the active material supported or held by the grid. The active material, i.e., the material that participates in the chemical reaction, is lead dioxide (PbO2) in the case of the positive electrode and lead (Pb) in the case of the negative electrode. The electrolyte is preferably dilute sulfuric acid (H2SO4).

[0008] When the battery discharges, lead, lead dioxide, and sulfuric acid react to produce lead sulfate (PbSO4) and water (H2O). During charging, the process is reversed, with lead sulfate and water being converted back into lead, lead dioxide, and sulfuric acid. Unlike other types of batteries, the electrolyte participates in the reaction. In an undesirable side reaction, water (H2O) decomposes into oxygen (O2) and hydrogen (H2).

[0009] As mentioned earlier, separators are placed between the electrode plates to prevent contact between plates with different polarizations, thus preventing short circuits. However, at the same time, the separators must allow the migration of ions participating in the reaction. Therefore, they must be electrically insulating on the one hand, and ion-permeable on the other. They should also be acid-resistant and oxidation-resistant. Suitable materials for lead-acid batteries include polyethylene (PE), polyvinyl chloride (PVC), and phenolic resin.

[0010] There are differences between different types of lead-acid batteries depending on the design of the positive and negative electrode plates.

[0011] GroE design according to DIN 40 738 standard ( Engeinbau, an acronym meaning large surface area plate (compact assembly), consists of a positive electrode plate made of pure lead with a layered surface structure. The positive electrode active material, PbO2, is then formed on the plate using a process known as chemical formation. The negative electrode plate is a cast grid made of lead or a lead alloy.

[0012] Other designs include the OPzS battery (Ortsfeste Panzerplatte Sonderseparation, meaning fixed plates with special isolation) and the OCSM battery (Ortsfoste Kupfer(CU)-Streck Metall, meaning fixed copper (CU) extended metal), where the positive plate is a tubular plate and its core grid is cast from a lead-antimony alloy. Lead-clad copper extended metal grids (OCSM) are also used in industrial negative plate grids.

[0013] GroE and OPzS types, featuring standard drop-cast or die-cast grids, are typically designed as closed-cell batteries. In closed-cell batteries, the electrolyte moves freely in liquid form, meaning it is not stationary, and as mentioned earlier, the water decomposition reaction produces oxygen or hydrogen at the electrodes. In principle, the generated gases must be vented from the battery casing via vent plugs. Because decomposition also leads to moisture loss, water must be added periodically.

[0014] In contrast to sealed batteries, there are also hermetically sealed batteries, in which the electrolyte is fixed as a gel or encased in fibrous material. Oxygen formed does not escape but diffuses to the negative electrode, where it reacts to produce water and lead sulfate. This prevents the formation of hydrogen gas. An example of a hermetically sealed design is the OPzV battery (Ortsfeste PanzerplatteVerschlossen, meaning sealed, fixed protective plates).

[0015] GroE batteries are advantageous due to their high corrosion resistance, resulting in a long service life. For example, they are particularly suitable for short-term, high-current discharges, making them ideal for emergency power supply in power plants. Thus, GroE batteries protect the control systems of power plants in the event of a failure, and also supply power to the cooling system via emergency power circuits.

[0016] A particular drawback of GroE batteries is that the positive plates show signs of oxidation over time. As a result, the positive plates grow during normal use, meaning they grow vertically, and therefore their height increases over time. Consequently, the positive plates occupy more space within the battery casing over time. This is addressed in the design by making the positive plates shorter than the negative plates. In this case, the negative plates protrude downwards relative to the positive plates in the vertical direction. This intermediate space can then be used for the growth of the positive plates during normal use.

[0017] The positive electrode plate continues to grow over time. Over this period, this can lead to insufficient space for its growth. This can result in the positive electrode plate being pressed against the base of the battery casing and pushed upwards as it continues to grow. Due to electrolyte sealing requirements, the connecting posts operatively attached to the positive electrode plate are fixed relative to the cover of the battery casing, and cracks can form in the cover, leading to electrolyte leakage. In the worst case, the connecting posts, firmly attached to the cover, could even push the cover upwards to the point of bursting. Utility Model Content

[0018] Based on the above, the purpose of this utility model is to ensure a long service life and safe operation, especially to avoid electrolyte leakage caused by the growth of the positive electrode plate. In terms of design, it further develops a lead-acid battery, especially a GroE battery.

[0019] To achieve this objective, the present invention proposes a lead-acid battery of the above type, characterized in that the connecting post of the positive electrode plate is received by an associated through hole so that it can move longitudinally relative to the cover.

[0020] According to this invention, a so-called through-type electrode structure is provided, which allows the connecting electrode to be displaced relative to the cover in the height direction. Therefore, the cover is not coupled to the connecting electrode in a force-transmitting manner, so that the movement of the electrode relative to the cover due to electrode plate growth is not hindered, thus allowing the electrode movement to occur. Therefore, the application of force to the cover due to electrode plate growth is avoided.

[0021] According to this invention, the connecting post is received in an associated through-hole in the cover, such that the connecting post can be longitudinally displaced. This allows the connecting post to shift relative to the cover. Therefore, if the positive electrode plate is fully grown and the connecting post electrically connected to the positive electrode plate moves upward, no force is exerted on the cover because the connecting post can move freely relative to the cover in the height direction.

[0022] The method according to this invention significantly extends the service life of this type of lead-acid battery, especially the GroE battery. An operating period of 20 years, preferably 25 years, or even more preferably 30 years or longer is possible. This enables the GroE battery to be used for emergency power supply, particularly in sensitive areas such as nuclear power plants, while maintaining enhanced safety. Thus, the design according to this invention achieves a longer service life while improving operational reliability.

[0023] According to another feature of this invention, the connecting terminal is liquid-tight relative to the cover. This prevents unwanted electrolyte leakage or escape through the contact area between the connecting terminal and the cover, thereby ensuring the safe operation of the lead-acid battery. Thus, this design ensures the liquid tightness and relative displacement of the connecting terminal relative to the cover.

[0024] According to another feature of this utility model, the connecting pole is designed to extend through a through hole, with an annular body inserted therebetween.

[0025] According to this particularly preferred embodiment, an annular body is provided for a liquid-tight seal between the terminal post and the cap. This annular body surrounds the connecting post and is inserted into a through-hole provided by the cap. Thus, the connecting post extends through the through-hole, with the annular body surrounding the outer post inserted between them. The annular body ensures a seal between the connecting post and the cap relative to the cap, and, in its function as a guide, ensures that relative displacement between the connecting post and the cap is guaranteed.

[0026] According to another feature of this invention, the annular body is arranged on the cover in a form-fitting manner. This form-fitting arrangement ensures that the annular body is securely positioned on the cover. It also makes installation easy. Furthermore, disassembly is possible by releasing the form-fitting connection between the annular body and the cover, especially in the case of maintenance.

[0027] The shape and arrangement of the annular body on the cap result in a near-integral design. Thus, the annular body is fixed in position relative to the cap, surrounding the associated connecting post, allowing it to move longitudinally. Consequently, the connecting post can move vertically relative to the annular body, and therefore also relative to the cap. This linear movement of the connecting post allows the positive electrode plate to grow in the manner already described, without the risk of electrolyte leakage.

[0028] According to another feature of this invention, it is proposed that, in the final assembled state, the annular body abuts against the upper side of the lid via a circumferential annular component, while simultaneously engaging the lower side of the lid with a locking lug. This configuration ensures, in the final assembled state, the aforementioned shape-fit connection between the annular body on one side and the lid on the other side is achieved. In this case, the design of the locking lug makes assembly very easy, as the annular body is inserted into the corresponding opening in the lid until the locking lug extends radially and engages with a locking hook for this purpose on the inner rear side of the lid. Therefore, in the final assembled state, the annular body is clamped and locked in place against the lid by its annular component on one side and by its locking lug on the other.

[0029] According to another feature of this utility model, the annular body has a first sealing element on the through-hole side. This first sealing element seals the annular body relative to the through-hole, that is, relative to the cover.

[0030] According to another feature of this invention, the annular body has a second seal on the side of the connecting pole. This seal provides a seal between the annular body on one side and the connecting pole on the other side.

[0031] The combination of the two seals provides a complete seal between the connecting post and the cap, that is, between the through-hole through which the connecting post passes.

[0032] Since the connecting electrode is arranged in the through-hole with the annular body inserted therebetween, two seals are provided: a first seal between the cap and the annular body, and a second seal between the annular body and the connecting electrode. This sealing system achieves a complete electrolyte seal. Because the connecting electrode can also move longitudinally relative to the annular body, the sealing system can function as intended even if the connecting electrode shifts in the height direction due to the growth of the electrode plate.

[0033] According to another feature of this invention, the annular body and the seal are made of plastic material. Preferably, the plastic material forming the seal is injection molded onto the annular body.

[0034] More preferably, both seals are injection molded onto the annular body and made of the same material. This results in a two-component plastic assembly consisting of an annular body on one side and an injection-molded seal on the other. This two-component design simplifies assembly and disassembly. Furthermore, it is easy to manufacture with minimal tolerances.

[0035] According to another feature of this utility model, the connecting post is provided with a plastic cap. The cap is preferably injection molded onto the connecting post.

[0036] The plastic cap on the connecting post improves the sealing effect of the aforementioned sealing system. The second seal, i.e., the seal between the annular body and the connecting post, does not directly abut the connecting post; instead, it is inserted between the cap on the connecting post and the annular body. Therefore, a seal is formed between the second seal on one side and the cap on the other side. The two plastic materials of the seal and the cap are in direct contact with each other, thus achieving a better seal. In particular, leakage due to sulfuric acid seeping along the external post is prevented.

[0037] As shown above, although the sealing system consists of a first seal and a second seal, 100% sealing cannot be achieved, especially between the connecting post and the annulus. This is because the electrolyte is based on sulfuric acid, which has a high tendency to seep. Therefore, over time, sulfuric acid will seep between the seal and the connecting post, and leak out at the top of the cap. This causes discoloration, particularly of the connecting post, which is caused by corrosion. This situation should preferably be avoided, and this is achieved preferably by a plastic cap attached to the connecting post. The plastic cap is preferably designed as a plastic coating formed by injection molding onto the connecting post or by overmolding. The plastic cap extends in the height direction, such that the plastic coating provides an additional seal in the contact area between the connecting post and the second seal of the annulus.

[0038] According to another feature of this invention, the connecting post has an insert made of conductive material and accessible from the front. This insert serves as the electrical contact between the connecting post and a connection contact point (e.g., a connection contact point provided by a cable). In this case, the insert is provided with a threaded hole for securely locating the connection contact point within the connecting post. During final assembly, a corresponding screw is screwed into this threaded hole, thereby detachably coupling the connecting post to the connection contact point.

[0039] According to another feature of this invention, the insert is made of copper or a copper alloy. This provides increased conductivity while minimizing the internal resistance of the electrode design.

[0040] According to another feature of this invention, the cap is provided with an opening. The threaded hole of the insert can be accessed from the outside through this opening. This ensures that the threaded hole provided by the insert can be accessed unrestricted and properly even with the cap on.

[0041] To provide a better electrolyte seal, the connecting post has grooves on its outer side. Several such grooves can be formed along the height of the connecting post, spaced apart from each other. These grooves form a labyrinthine guiding structure around the circumference of the connecting post. This labyrinthine guiding structure has two functions. On the one hand, it extends the seepage distance of sulfuric acid between the connecting post and the cap; on the other hand, it achieves a better connection between the connecting post or its material on one side and the plastic sheath forming the cap on the other side.

[0042] In its intended use, the connecting pole is equipped with a connecting element, such as a contact point, on its front side. This connecting element is secured to a copper insert provided by the connecting pole by screws. In this intended use configuration, since the connecting pole is completely surrounded by a plastic sheath, direct access to the connecting pole is no longer possible, for example, for performing electrical measurements. Therefore, in a particularly preferred embodiment, the plastic sheath of the connecting pole may be provided with an open notch, allowing a measuring instrument to contact the connecting pole if necessary.

[0043] According to another feature of this invention, the connecting post is provided with a coating on its outer side. This coating may in particular be an adhesion promoter, which is used to improve the connection between the connecting post on one side and the plastic sheath on the other side, thereby also improving the sealing between the two.

[0044] According to another feature of this utility model, the external pole post is provided to have a foot that terminates in the cap without a step in the radial direction.

[0045] The grooves providing the labyrinthine guide structure are preferably formed by machining processes, such as lathe machining. In this process, the head of the connecting post is machined to such a degree that, after the cap is completed, a stepless transition is formed to the unmachined foot of the connecting post. This advantageously prevents the connecting post from potentially hitting the step on the lower side of the cap when it moves upward in the height direction. Thus, the possibility of displacement of the connecting post provided by this invention is not hindered by the design of the plastic sheath forming the cap of the connecting post.

[0046] In summary, the present invention provides a through-type electrode structure having a connecting electrode that can be longitudinally displaced compared to the cap. This particularly allows for the growth of the positive electrode plate without the risk of electrolyte leakage between the connecting electrode and the cap. A sealing system is preferably provided, having two seals: one on the connecting electrode side and one on the cap side, both provided by an annular body surrounding the connecting electrode. To further improve the sealing effect, the connecting electrode can be equipped with a plastic coating on its head side, which interacts with the seal carried by the annular body. Furthermore, a labyrinthine guiding structure is preferably formed between the connecting electrode and the coating, which extends the permeation distance of sulfuric acid and also establishes a tighter connection between the connecting electrode and the plastic coating. Attached Figure Description

[0047] Other features and advantages of this invention will become apparent from the following description with reference to the accompanying drawings.

[0048] Figure 1 A schematic side view shows a lead-acid battery according to the present invention;

[0049] Figure 2 The pole post through-structure according to the present invention is shown in schematic detailed view;

[0050] Figure 3 A schematic perspective view of the annular body according to the present invention is shown;

[0051] Figure 4 It shows according to Figure 3 A schematic side view of a ring-shaped body;

[0052] Figure 5 It shows according to Figure 4 A schematic cross-sectional view of the annular body along section line AA;

[0053] Figure 6 It shows according to Figure 5 The details of the annular body, i.e., the schematic cross-sectional view according to detail Z;

[0054] Figure 7 A schematic perspective view of the connection poles according to the prior art is shown;

[0055] Figure 8 A schematic perspective view of the connecting pole according to the present invention is shown;

[0056] Figure 9 A schematic cross-sectional view of the pole post through-structure according to the present invention is shown;

[0057] Figure 10 A schematic cross-sectional view of the connecting pole according to the present invention during the first manufacturing step is shown;

[0058] Figure 11 It shows according to Figure 10 A schematic diagram of the connecting pole in the second manufacturing step;

[0059] Figure 12 It shows according to Figure 10 and Figure 11 A schematic diagram of the connecting pole in the final third manufacturing step. Detailed Implementation

[0060] exist Figure 1 The diagram shows a schematic cross-sectional view of a battery 1 using a GroE battery design according to the present invention.

[0061] The battery 1 has a casing 2 and a plurality of electrode plates 6 and 7 arranged in the casing 2. Positive electrode plates 6 and negative electrode plates 7 are provided, and the positive electrode plates 6 and negative electrode plates 7 alternate with each other, with corresponding separators 8 inserted between them.

[0062] The outer casing 2 is formed of two parts, having a base 3 with an opening on one side and a cover 5 that closes the opening side 4 of the base 3. When finally assembled, the base 3 and the cover 5 are connected to each other in a liquid-tight manner.

[0063] The positive electrode plate 6 on one side and the negative electrode plate 7 on the other side are electrically connected to each other via unit connectors 12 or 13. Each unit connector 12 or 13 carries a connecting post 14 or 15. Figure 1 In the embodiment shown, the positive electrode plates 6 are electrically connected to each other via unit connectors 13. Unit connectors 12 connect the negative electrode plates 7 to each other.

[0064] from Figure 1 The diagram also shows that the unit connector 12 of the positive electrode plate 6 carries the connecting post 15. The unit connector 13 of the negative electrode plate 7 carries the connecting post 14.

[0065] In order to connect the poles 14 and 15 from the outside, corresponding through holes 16 are formed in the cover 5, through which the poles 14 and 15 extend. Figure 2 The background of this fact is illustrated in detail using the example of connecting pole 15.

[0066] like Figure 1 As further shown, the base 3 of the outer casing 2 provides a casing base 9. The casing base 9 has webs 10 on its inner side. The negative electrode plate 7 is supported on these webs 10. The positive electrode plate 6 is shorter than the negative electrode plate 7 in the height direction 17. Thus, they are received by the base 3 of the outer casing 2 in a free-hanging manner, rather than being supported by the webs 10. Instead, a free space is left between the corresponding lower edge of the positive electrode plate 6 on one side and the web 10 on the other side.

[0067] During the intended use of the battery 1, the positive electrode plate 6 grows in the height direction 17 due to oxidation. In this case, the positive electrode plate 6 grows downward in the height direction 17, that is, towards the web plate 10. Thus, the free space left between the positive electrode plate 6 and the web plate 10 is used to accommodate the expansion of the electrode plate 6 due to growth.

[0068] However, if the battery 1 operates for a sufficiently long time, the free space left between the lower edge of the electrode plate 6 and the web 10 may be insufficient to compensate for the enlargement of the positive electrode plate 6 due to growth, which is disadvantageous. This may cause the electrode plate 6 to abut against the web 10 when it reaches the web, resulting in the disadvantage of the electrode plate being pushed upwards. To ensure that no electrolyte leakage occurs between the connecting post 15 and the associated through hole 16 when the positive electrode plate 6 is pushed upwards, a post through-hole structure is proposed according to the present invention. This post through-hole structure ensures a safe seal between the connecting post 15 and the cover 5 while guaranteeing the longitudinal displacement of the connecting post 15 relative to the through hole 16, and thus the longitudinal displacement relative to the cover 5. Preferably, the same type of post through-hole structure is provided for the connecting post 14.

[0069] Therefore, the pole post through-structure of this utility model has an annular body 18, such as... Figures 3-6 As shown in detail below.

[0070] The annular body 18 is provided with a sleeve element 20. For example, it can be obtained from... Figure 3 and Figure 4 As can be seen in the combined view, the sleeve element 20 is equipped with an annular part 19 on the upper side and a locking lug 21 equipped with a locking hook 22 on the lower side.

[0071] The annular body 18 is also equipped with a sealing system having two seals, namely a first seal 23 and a second seal 24. In the final assembled state, the first seal 23 is arranged between the annular body 18 and the cover 5, while the second seal 24 seals between the annular body 8 and the connecting post 15. (The last sentence appears to be incomplete and possibly refers to a different product.) Figure 5 and Figure 6 The comparison shows that each seal 23 and 24 is designed as a circumferential strip that abuts against the sleeve element 20 of the annular body 18.

[0072] In the final assembled state, such as Figure 2 and Figure 9 As can be seen, the annular body 18 is inserted into the corresponding through hole 16 in a shape-fitting manner. The annular body 18 abuts against the upper side of the cover 5 via its annular component 19, and the locking hook 22 provided by the locking lug 21 engages on the back side of the cover 5 from the lower side. Figure 9 This is especially evident in the detailed view.

[0073] In the final assembled state, the connecting post 15 extends through the annular body 18, and thus the connecting post 15 also extends through the through hole 16, with the annular body 18 inserted between them. According to Figure 9 The background of this fact is particularly evident in the illustration.

[0074] from Figure 9 The illustration also shows that, in the final assembled state, seal 23 is located between the annular body 18 and the cover 5, while seal 24 is located between the annular body 18 and the connecting post 15. This ensures a seal on the connecting post 15 relative to the cover 5, while allowing the connecting post 15 to move upward in the height direction 17.

[0075] In a particularly preferred embodiment, the connecting post 15 is equipped with a sheath forming a cap 25. In the final assembled state, this cap 25 abuts against a seal 24 provided by the annular body 18, thereby achieving a better seal. The plastic sheath forming the cap 25 is preferably injection molded onto the connecting post 15.

[0076] For connecting the electrical contacts of the terminal 15, a threaded hole 27 is provided, which is accessible from the front side of the terminal 15. This threaded hole 27 is preferably provided by an insert 26 embedded in the terminal 15, the insert 26 being made of copper to reduce internal resistance. The cap 25 is equipped with a corresponding opening 28 to allow external access to the threaded hole 27.

[0077] Figure 7 The design of the connection pole 15 according to the prior art is shown. Figure 8 The connecting post 15 according to this utility model is shown. A comparison of these two figures shows that, as... Figure 8 The connecting post 15 according to the present invention shown is equipped with a cap 25 designed as described above. The outer post 15 has a foot 31 that terminates without a step in the radial direction at the cap 25. Thus, the entire outer surface provided by the outer post 15 transitions smoothly from the foot 31 to the head without a step.

[0078] To achieve a better seal against unwanted electrolyte leakage, the outer electrode post 15 is equipped with a labyrinth-style guide structure in the area of ​​the cap 25. (See also...) Figure 9 , Figure 11 and Figure 12 As can be seen, the labyrinth-like guidance structure is formed by multiple grooves 29 arranged vertically in the height direction 17.

[0079] To design the connecting post 15 according to this utility model, the connecting post 15 is first cast from lead or a lead alloy (e.g., hard lead), and an insert 26 is provided on the front side, such as... Figure 10As shown in the diagram. Then, in the second machining step, the head of the connecting post 15 is turned to reduce the diameter of the connecting post 15 in the head, and simultaneously form a groove 29. Then, an adhesion promoter 30 is applied to the surface of the head 90.

[0080] In the third processing step, a cap 25 is formed by covering the head of the molded connecting post 15 with a plastic sheath. This plastic sheath engages in a groove 29, ensuring a tight connection with the lead material of the connecting post 15. Furthermore, the groove design has the advantage of extending the seepage distance of sulfuric acid, which tends to leak, thereby minimizing any leakage.

[0081] Figure Labels

[0082] 1 Battery 17 Height Direction

[0083] 2 outer shells and 18 ring-shaped bodies

[0084] 3 base 19 ring component

[0085] 4-opening side 20 sleeve element

[0086] 5. Lid 21. Locking lug

[0087] 6 positive electrode plates 22 locking hooks

[0088] 7 Negative electrode plate 23 First sealing element

[0089] 8 partition plate 24 second seal

[0090] 9. Outer shell, base, 25. Cap

[0091] 10 web plates 26 inserts

[0092] 11 volumetric space 27 threaded holes

[0093] 12-unit connector with 28 openings

[0094] 13 Unit Connector 29 Grooves

[0095] 14 Connecting poles with 30 coating

[0096] 15 Connecting pole 31 Foot

[0097] 16 through holes.

Claims

1. A lead-acid battery having a casing (2) and a plurality of electrode plates (6, 7) arranged in the casing (2), wherein a positive electrode plate (6) and a negative electrode plate (7) are provided, the positive electrode plate (6) and the negative electrode plate (7) alternating with each other, and a separator (8) is inserted between them, wherein the casing (2) has a base (3) open on one side and a cover (5) closing the open side (4) of the base (3), wherein the positive electrode plate (6) on one side and the negative electrode plate (7) on the other side are electrically connected to each other by corresponding unit connectors (12, 13), wherein each unit connector (12, 13) carries a connecting post (14, 15), wherein the connecting post (14, 15) extends through a corresponding through hole (16) in the cover (5), characterized in that, The connecting post (15) of the positive electrode plate (6) is received by an associated through hole (16) so that it can be longitudinally displaced relative to the cover (5).

2. The storage battery according to claim 1, characterized in that, The connecting pole (15) is liquid-tightly sealed relative to the cover (5).

3. The storage battery according to claim 1, characterized in that, The connecting pole (15) extends through the through hole (16) and an annular body (18) is inserted therebetween the connecting pole (15).

4. The storage battery according to claim 3, characterized in that, The annular body (18) is arranged on the cover (5) in a shape-fitting manner.

5. The storage battery according to claim 4, characterized in that, In the final assembled state, the annular body (18) abuts against the upper side of the cover (5) by means of the circumferential annular component (19), while engaging the lower side of the cover (5) by means of the locking lug (21).

6. The storage battery according to claim 5, characterized in that, The annular body (18) has a first seal (23) on one side of the through hole.

7. The storage battery according to claim 6, characterized in that, The annular body (18) has a second seal (24) on the side of the connecting pole.

8. The storage battery according to claim 7, characterized in that, The annular body (18) and the seals (23, 24) are made of plastic material.

9. The storage battery according to claim 8, characterized in that, The plastic material forming the seal (23, 24) is injection molded onto the annular body (18).

10. The storage battery according to claim 1, characterized in that, The connecting pole (15) has a cap (25) made of plastic material.

11. The storage battery according to claim 10, characterized in that, The cap (25) is injection molded onto the connecting post (15).

12. The storage battery according to claim 10, characterized in that, The connecting pole (15) has an insert (26) made of conductive material and accessible from the front.

13. The storage battery according to claim 12, characterized in that, The insert (26) is provided with a threaded hole (27).

14. The storage battery according to claim 12, characterized in that, The insert (26) is made of copper or a copper alloy.

15. The storage battery according to claim 10, characterized in that, The cap (25) has an opening (28).

16. The storage battery according to claim 1, characterized in that, The connecting pole (15) has a groove (29) on the outside.

17. The storage battery according to claim 16, characterized in that, The connecting pole (15) is coated with a coating (30) on the outside.

18. The storage battery according to claim 10, characterized in that, The connecting pole (15) has a foot (31) that terminates in the cap (25) without a step in the radial direction.

Images