Inverted battery cell and vehicle

Abstract

The invention discloses an inverted battery cell and a vehicle, the inverted battery cell comprises a top cover, a shell, a roll core and a liquid guide piece, the shell is provided with a containing cavity, the top cover is connected with the shell and seals an opening of the containing cavity, the roll core is arranged in the containing cavity, and the roll core and the top cover are spaced to form an electrolyte distribution cavity; and the liquid guide piece is connected to the roll core, part of the liquid guide piece extends into the electrolyte distribution cavity, and the liquid guide piece can guide the electrolyte in the electrolyte distribution cavity to the roll core. According to the inverted battery cell disclosed by the invention, the electrolyte in the electrolyte distribution cavity can be drained to the roll core by utilizing the liquid guide piece, so that the roll core can absorb the electrolyte, the normal cycle performance and storage performance can be maintained when the battery cell is inversely mounted, the injection amount of the electrolyte does not need to be increased, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to an inverted battery cell and a vehicle. Background Art

[0002] Currently, driving range and safety are important indicators for the development of electric vehicles. In order to achieve a long driving range, the battery is used inverted, which can make full use of the battery height space and combine it with the safety exhaust gap design to achieve a higher volume energy density and high safety of the battery.

[0003] However, when the battery cell is used upside down, the original free electrolyte inside the battery cell will be concentrated at the top cover, resulting in the free electrolyte being unable to be absorbed by the core, thereby deteriorating the battery cell's cycle performance and storage performance. The existing technology raises the electrolyte level by increasing the amount of electrolyte injected to achieve the absorption of the electrolyte by the core, which greatly increases the cost.

[0004] Therefore, how to ensure the cycle performance and storage performance of the battery cell when the battery cell is inverted while reducing the manufacturing cost has become an urgent problem that needs to be solved. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, an embodiment of the present invention proposes an inverted battery cell, including a top cover, a shell, a winding core and a liquid guiding member. The winding core is arranged in a accommodating cavity formed by the top cover and the shell and is spaced from the top cover to form an electrolyte distribution cavity. The liquid guiding member is connected to the winding core, and part of the liquid guiding member extends into the electrolyte distribution cavity formed by the winding core and the top cover. Therefore, when the winding core is inverted, the liquid guiding member can drain the electrolyte in the electrolyte distribution cavity to the winding core, so that the winding core can absorb the electrolyte, so that the battery can maintain normal cycle performance and storage performance when installed inverted, and there is no need to increase the injection amount of the electrolyte, thereby reducing the production cost.

[0007] An embodiment of the present invention further provides a vehicle.

[0008] The inverted battery cell of the embodiment of the present invention is characterized in that it includes: a top cover, a shell and a winding core, the shell having a accommodating cavity, the top cover is connected to the shell and closes the opening of the accommodating cavity, the winding core is arranged in the accommodating cavity and the winding core and the top cover are spaced to form an electrolyte distribution cavity; a liquid guiding member, the liquid guiding member is connected to the winding core and a portion of the liquid guiding member extends into the electrolyte distribution cavity.

[0009] In the inverted battery cell of the embodiment of the present invention, the liquid guiding member is connected to the winding core, and part of the liquid guiding member extends into the electrolyte distribution cavity formed by the winding core and the top cover. Therefore, when the winding core is inverted, the liquid guiding member can drain the electrolyte in the electrolyte distribution cavity to the winding core, so that the winding core can absorb the electrolyte, so that the battery can maintain normal cycle performance and storage performance when installed inverted, and there is no need to increase the injection amount of the electrolyte, thereby reducing the production cost.

[0010] In some embodiments, the liquid-conducting member is a liquid-conducting membrane with a porous structure, and the liquid-conducting membrane is attached to the outer peripheral surface of the winding core.

[0011] In some embodiments, the liquid-conducting diaphragm includes a straight section and a bent section, the straight section is attached to the outer surface of the winding core, and the bent section is connected to the end of the straight section facing the top cover and is in contact with the top cover.

[0012] In some embodiments, the top cover includes a cover plate and a support plate, the cover plate closes the opening of the accommodating cavity, the support plate is connected to the side of the cover plate facing the winding core and the support plate abuts against the winding core.

[0013] In some embodiments, the support plate includes at least one outer support plate adjacent to the edge of the cover body, and the outer support plate has a matching groove that penetrates the outer support plate along the inner and outer directions, the straight section is attached to the outer surface of the outer support plate, and the bent section is inserted into the matching groove.

[0014] In some embodiments, the inverted battery cell also includes a pressure plate, which includes an outer plate and a clip, the outer plate is pressed against the outer side of the liquid-conducting film, the clip is connected to the inner side of the outer plate, and the clip passes through the liquid-conducting diaphragm and is clipped to the outer support plate.

[0015] In some embodiments, the porosity of the liquid-conducting membrane is a, then 20%≤a≤35%.

[0016] In some embodiments, the thickness of the liquid-conducting diaphragm is t, then 0.01 mm<t<2 mm.

[0017] In some embodiments, the winding core is rectangular, the liquid-conducting membrane is attached to the end surface of the winding core, and in the width direction of the winding core, the size of the liquid-conducting membrane is less than or equal to the size of the winding core.

[0018] The vehicle according to the embodiment of the present invention includes the inverted battery cell as described in the above embodiment.

[0019] The vehicle of the embodiment of the present invention adopts the above-mentioned inverted battery cell, the liquid guiding member is connected to the winding core, and part of the liquid guiding member extends into the electrolyte distribution cavity formed by the winding core and the top cover. Therefore, when the winding core is inverted, the liquid guiding member can drain the electrolyte in the electrolyte distribution cavity to the winding core, so that the winding core can absorb the electrolyte, so that the battery can maintain normal cycle performance and storage performance when installed inverted, and there is no need to increase the injection amount of the electrolyte, thereby reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of an inverted battery cell according to an embodiment of the present invention.

[0021] Figure 2 is an exploded view of an inverted battery cell according to an embodiment of the present invention.

[0022] Figure 3 is an assembly diagram of a top cover and a winding core of an inverted battery cell according to an embodiment of the present invention.

[0023] Figure 4 1 is an assembly diagram of a top cover, a winding core and a liquid guide member of an inverted battery cell according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Top cover 1, cover body 11, support plate 12, matching groove 121, shell body 2, winding core 3, liquid guide 4, straight section 41, bending section 42, pressing plate 5, buckle 51, explosion-proof valve 6. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0027] like Figure 1-Figure 4 As shown, the inverted battery cell of the present invention includes a top cover 1, a shell 2, a winding core 3 and a liquid guide 4.

[0028] Specifically, Figure 1-Figure 4 As shown, the shell 2 has a accommodating cavity, the top cover 1 is connected to the shell 2 and closes the opening of the accommodating cavity, the winding core 3 is arranged in the accommodating cavity and the winding core 3 and the top cover 1 are spaced to form an electrolyte distribution cavity, and the liquid guiding member 4 is connected to the winding core 3 and a part of the liquid guiding member 4 extends into the electrolyte distribution cavity.

[0029] It should be noted that the spacing between the top cover 1 and the winding core 3 is a conventional design of the battery. On the one hand, it can provide space for the assembly of the poles, and on the other hand, it can protect the winding core 3 from being separated when the top cover 1 is impacted from the outside.

[0030] Furthermore, the electrolyte of a conventional battery is concentrated at the bottom of the shell 2 and can directly soak the core 3. However, when the core 3 is inverted, the electrolyte will be concentrated in the spacing cavity (electrolyte distribution cavity) between the top cover 1 and the core 3. In order to allow the electrolyte to soak the core 3, the conventional method is usually to increase the injection amount of the electrolyte to raise the liquid level of the electrolyte. This design method will undoubtedly increase the cost.

[0031] In the present application, a liquid guiding member 4 connected to the winding core 3 is newly added, and a portion of the liquid guiding member 4 is extended into the electrolyte cavity, so that the electrolyte can be drained to the winding core 3, thereby solving the problem that the winding core 3 cannot absorb the electrolyte when it is inverted, and there is no need to increase the injection amount of the electrolyte.

[0032] In the inverted battery cell of the embodiment of the present invention, the liquid guiding member 4 is connected to the winding core 3, and a portion of the liquid guiding member 4 extends into the electrolyte distribution cavity formed by the winding core 3 and the top cover 1. Therefore, when the winding core 3 is inverted, the liquid guiding member 4 can drain the electrolyte in the electrolyte distribution cavity to the winding core 3, so that the winding core 3 can absorb the electrolyte, so that the battery can maintain normal cycle performance and storage performance when installed inverted, and there is no need to increase the injection amount of the electrolyte, thereby reducing the production cost.

[0033] Preferably, the liquid-conducting member 4 is a liquid-conducting membrane with a porous structure, and the liquid-conducting membrane is attached to the outer peripheral surface of the winding core 3. It can be understood that the liquid-conducting member 4 with a porous structure has a strong ability to adsorb and transfer the electrolyte, which facilitates the winding core 3 to fully absorb the electrolyte, and the membrane structure can fully contact the winding core 3, further improving the absorption capacity of the winding core 3 for the electrolyte.

[0034] Preferably, if Figure 1-Figure 4 As shown, the liquid-conducting diaphragm includes a straight section 41 and a bent section 42. The straight section 41 is attached to the outer surface of the winding core 3, and the bent section 42 is connected to the end of the straight section 41 facing the top cover 1 and is in contact with the top cover 1. As a result, the bent section 42 in contact with the top cover 1 can extend into the bottom of the electrolyte distribution cavity, which is convenient for fully draining the electrolyte and reducing the injection amount requirement of the electrolyte to the lowest. Secondly, since the bent section 42 is in contact with the top cover 1, the bent section 42 with a certain expansion area can fully contact the electrolyte, thereby improving the drainage efficiency.

[0035] In some embodiments, Figure 1-Figure 4 As described above, the top cover 1 includes a cover plate and a support plate 12. The cover plate closes the opening of the accommodating cavity. The support plate 12 is connected to the side of the cover plate facing the winding core 3 and the support plate 12 abuts against the winding core 3. Thus, the support plate 12 can support the top cover 1 and improve the anti-collision performance of the top cover 1. Preferably, the support plate 12 is a plastic part.

[0036] Preferably, if Figure 1-Figure 4As shown, the support plate 12 includes at least one outer support plate 12 adjacent to the edge of the cover body 11, and the outer support plate 12 has a matching groove 121 that penetrates the outer support plate 12 in the inner and outer directions, the straight section 41 is attached to the outer surface of the outer support plate 12, and the bent section 42 is inserted into the matching groove 121. Thus, the assembly of the bent section 42 and the matching groove 121 can achieve a positioning effect, and at the same time, the matching groove 121 is a through groove, which will not hinder the contact between the bent section 42 and the electrolyte, and the outer support plate 12 can support the straight section 41, further improving the stability of the assembly of the liquid-conducting diaphragm.

[0037] Furthermore, the inverted battery cell also includes a pressure plate 5, which includes an outer plate and a buckle 51. The outer plate is pressed against the outer side of the liquid-conducting film, the buckle 51 is connected to the inner side of the outer plate, and the buckle 51 passes through the liquid-conducting diaphragm and is clamped with the outer support plate 12.

[0038] It can be understood that the pressing plate 5 can be used as a fixing member to fasten the liquid-conducting diaphragm to the outer supporting plate 12, so as to further improve the stability of the assembly of the liquid-conducting diaphragm.

[0039] Optionally, the pressing plate 5 and the outer supporting plate 12 are not limited to the snap-fit ​​cooperation as described above, as long as a detachable connection between the two can be achieved.

[0040] Furthermore, the porosity of the liquid-conducting membrane is a, then 20% ≤ a ≤ 35%. It should be noted that the greater the porosity of the porous structure, the greater the liquid absorption capacity of the liquid-conducting membrane, but at the same time the structural stability of the liquid-conducting membrane will decrease accordingly. In order to ensure the drainage efficiency while enabling the liquid-conducting membrane to be used for a long time, the inventors of the present application found that when the porosity is between 20% and 35%, the drainage capacity and structural stability of the liquid-conducting membrane are both optimal. For example, a can be 20%, 30% or 35%.

[0041] For example, when the liquid-conducting diaphragm is required to transfer electrolyte quickly and in large quantities, a can be set to 35%;

[0042] When the liquid-conducting diaphragm needs to be used for a long time, a can be set to 20%;

[0043] Preferably, a is 30%, and the liquid-conducting diaphragm has long-term stability under the premise of efficient drainage.

[0044] Furthermore, the thickness of the liquid-conducting diaphragm is t, then 0.01 mm<t<2 mm. For example, t may be 0.5 mm, 1 mm or 1.5 mm.

[0045] For example, when t is 0.5 mm, the adhesion effect between the liquid-conducting membrane and the winding core 3 is good, and the liquid transfer efficiency is high.

[0046] When t is 1.5 mm, the liquid-absorbing capacity of the liquid-conducting diaphragm is strong, the winding core 3 can fully absorb the electrolyte, and the battery energy density is high.

[0047] Preferably, t is 1 mm, the liquid transfer efficiency of the liquid-conducting diaphragm is high, and the winding core 3 can fully absorb the electrolyte.

[0048] Preferably, if Figure 1-Figure 4 As shown, the winding core 3 is rectangular, the liquid-conducting diaphragm is attached to the end surface of the winding core 3, and in the width direction of the winding core 3, the size of the liquid-conducting diaphragm is less than or equal to the size of the winding core 3. Therefore, the liquid-conducting diaphragm attached to the end surface of the winding core 3 only needs to be designed with a smaller area size to transfer electrolyte to each electrode.

[0049] Preferably, the liquid-conducting membrane and the winding core 3 are connected by bonding, hot-melt connection, etc. Optionally, the liquid-conducting membrane and the winding core 3 can also be connected to the winding core 3 by other methods.

[0050] Optionally, the liquid-conducting diaphragm is made of one of materials such as PP, PE, PET, PI, PET, PBT, cellulose film, PA, aramid, spandex, etc., or a combination of the above materials.

[0051] Optionally, the support plate 12 further includes a middle support plate 12 located in the middle of the cover body 11 .

[0052] Optionally, an explosion-proof valve 6 is provided in the middle of the cover body 11 .

[0053] The vehicle according to the embodiment of the present invention includes the inverted battery cell according to the above embodiment.

[0054] The vehicle of the embodiment of the present invention adopts the above-mentioned inverted battery cell, the liquid guiding member 4 is connected to the winding core 3, and a portion of the liquid guiding member 4 extends into the electrolyte distribution cavity formed by the winding core 3 and the top cover 1. Therefore, when the winding core 3 is inverted, the liquid guiding member 4 can drain the electrolyte in the electrolyte distribution cavity to the winding core 3, so that the winding core 3 can absorb the electrolyte, so that the battery can maintain normal cycle performance and storage performance when installed inverted, and there is no need to increase the injection amount of the electrolyte, thereby reducing the production cost.

[0055] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An inverted battery cell, characterized in that: include: A top cover (1), a shell (2) and a winding core (3), wherein the shell (2) has a receiving cavity, the top cover (1) is connected to the shell (2) and closes the opening of the receiving cavity, the winding core (3) is arranged in the receiving cavity and the winding core (3) and the top cover (1) are spaced apart to form an electrolyte distribution cavity; A liquid guiding member (4), wherein the liquid guiding member (4) is connected to the winding core (3) and a portion of the liquid guiding member (4) extends into the electrolyte distribution cavity.

2. The inverted battery cell according to claim 1, characterized in that: The liquid-conducting member (4) is a liquid-conducting membrane with a porous structure, and the liquid-conducting membrane is attached to the outer peripheral surface of the winding core (3).

3. The inverted battery cell according to claim 2, characterized in that: The liquid-conducting diaphragm comprises a straight section (41) and a bent section (42); the straight section (41) is attached to the outer surface of the winding core (3); the bent section (42) is connected to the end of the straight section (41) facing the top cover (1) and is in contact with the top cover (1).

4. The inverted battery cell according to claim 3, characterized in that: The top cover (1) comprises a cover plate and a support plate (12), wherein the cover plate closes the opening of the accommodating cavity, and the support plate (12) is connected to the side of the cover plate facing the winding core (3) and the support plate (12) abuts against the winding core (3).

5. The inverted battery cell according to claim 4, characterized in that: The support plate (12) comprises at least one outer support plate (12) adjacent to the edge of the cover body (11), and the outer support plate (12) has a matching groove (121) penetrating the outer support plate (12) along the inner and outer directions, the straight section (41) is attached to the outer surface of the outer support plate (12), and the bent section (42) is inserted into the matching groove (121).

6. The inverted battery cell according to claim 4, characterized in that: It also includes a pressing plate (5), the pressing plate (5) including an outer plate and a buckle (51), the outer plate is pressed against the outer side surface of the liquid-conducting film, the buckle (51) is connected to the inner side surface of the outer plate, and the buckle (51) passes through the liquid-conducting diaphragm and is buckled with the outer support plate (12).

7. The inverted battery cell according to claim 2, characterized in that: The porosity of the liquid-conducting membrane is a, then 20%≤a≤35%.

8. The inverted battery cell according to claim 2, characterized in that: The thickness of the liquid-conducting diaphragm is t, then 0.01 mm<t<2 mm.

9. The inverted battery cell according to claim 2, characterized in that: The winding core (3) is rectangular in shape, the liquid-conducting membrane is attached to the end surface of the winding core (3), and in the width direction of the winding core (3), the size of the liquid-conducting membrane is less than or equal to the size of the winding core (3).

10. A vehicle, characterized in that: Comprising an inverted battery cell as claimed in any one of claims 1 to 9.

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