Roll core, battery and vehicle
By placing the negative electrode starting section and the positive electrode starting section in the core in the straight area and arranged on opposite sides of the winding center, the lithium evolution problem caused by the difficulty in controlling the extension length of the negative electrode sheet in the core is solved, and the uniform thickness of the core and the energy density are improved.
Patent Information
- Application Number
- CN202421402921.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-19
AI Technical Summary
The extension length of the inner end of the negative electrode sheet of the coil core at the corner position of the positive electrode sheet is difficult to control, resulting in excessive local stress, which can easily cause lithium separation problems.
By placing the negative electrode starting section of the negative electrode sheet and the positive electrode starting section of the positive electrode sheet in a straight area and arranged on opposite sides of the winding center respectively, lithium evolution problems caused by excessive local stress in the negative electrode starting section and the positive electrode starting section are avoided.
The uniform thickness of the core is achieved, the manufacturing process is simplified, the lithium excretion problem is avoided, and the energy density of the core is increased.
Smart Images
Figure CN222838882U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and in particular to a winding core, a battery and a vehicle. Background Art
[0002] As the competition for technical indicators in the electric vehicle field becomes increasingly fierce, users are increasingly concerned about the range of electric vehicles, and the parameter indicator directly related to the range is the energy density of the battery cell, that is, more energy can be packed into the battery cell under unit weight or unit volume conditions. Therefore, for batteries of a certain volume, the efficient design of the internal winding core main structure is particularly important. In the related technology, however, the above-mentioned winding core is prone to lithium plating problems, and the use effect is poor. Utility Model Content
[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:
[0004] In the actual production process of the core, the inner end of the negative electrode sheet of the core usually extends to the corner of the positive electrode sheet, but the extension length of the inner end of the negative electrode sheet at the corner of the positive electrode sheet is difficult to control. When the extension length of the inner end of the negative electrode sheet is too long, it will occupy the space in the thickness direction of the core and may cause excessive local stress, which may easily cause local lithium deposition problems.
[0005] The utility model 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 utility model proposes a winding core, which has a simple manufacturing process and uniform thickness, and can avoid the problem of lithium deposition caused by excessive local stress.
[0007] The embodiment of the utility model further provides a battery.
[0008] An embodiment of the utility model further provides a vehicle.
[0009] The winding core of an embodiment of the utility model comprises: a positive electrode sheet, a negative electrode sheet and a separator for separating the positive electrode sheet and the negative electrode sheet, the positive electrode sheet, the negative electrode sheet and the separator are wound and arranged to form a straight area and a bending area, the bending area is arranged on one side of the length direction of the straight area, and the straight area has a winding center; the negative electrode sheet comprises a negative electrode starting section, and the negative electrode starting section is located in the straight area, the positive electrode sheet comprises a positive electrode starting section, and the positive electrode starting section is located in the straight area, and the negative electrode starting section and the positive electrode starting section are respectively arranged on opposite sides of the winding center.
[0010] According to the winding core of the embodiment of the utility model, the negative electrode starting section and the positive electrode starting section are both located in the straight area, and the negative electrode starting section and the positive electrode starting section are respectively arranged on opposite sides of the winding center, thereby making the thickness of the position of the winding core adjacent to the winding center uniform, so as to avoid the problem of lithium deposition caused by excessive local stress in the negative electrode starting section and the positive electrode starting section. It can be understood that when the winding core is wound, the positive electrode starting section exceeds the negative electrode starting section, so that the negative electrode starting section and the positive electrode starting section are arranged on opposite sides of the winding center, thereby reducing the consumables of a part of the negative electrode sheet, and ensuring that the metal ions released from the inner side of the positive electrode starting section can be embedded in the corresponding negative electrode starting section, thereby improving the energy density of the winding core. Therefore, the winding core of the embodiment of the utility model does not need to control the extension length of the negative electrode starting section in the bending area, the manufacturing process is simple, the thickness is uniform, and the problem of lithium deposition caused by excessive local stress in the negative electrode starting section and the positive electrode starting section can be avoided.
[0011] In some embodiments, the positive electrode sheet also includes a positive bending section, the positive bending section is located in the bending area, the head end of the positive bending section is connected to the tail end of the positive starting section, and the head end of the negative starting section is arranged adjacent to the tail end of the positive bending section.
[0012] In some embodiments, an extension length of the positive electrode starting segment in the straight region is equal to an extension length of the negative electrode starting segment in the straight region.
[0013] In some embodiments, the positive electrode sheet also includes a positive electrode bending section, which is located in the bending zone, and the head end of the positive electrode bending section is connected to the tail end of the positive starting section. The winding core also includes a blocking member, which is arranged in the bending zone and adjacent to the positive electrode bending section, and the blocking member is used to prevent the positive electrode bending section from escaping metal ions.
[0014] In some embodiments, the blocking member is disposed on the inner side surface of the positive electrode bending section; and / or, the blocking member is disposed on the diaphragm corresponding to the inner side surface of the positive electrode bending section.
[0015] In some embodiments, the blocking member is a tape, the tape is bonded to the inner side of the positive electrode bending section, and the porosity of the tape is smaller than the porosity of the diaphragm.
[0016] In some embodiments, the leading end of the blocking member extends into the straight area and extends along the length direction of the positive electrode starting section, and the trailing end of the blocking member extends into the straight area and extends along the length direction of the negative electrode starting section.
[0017] In some embodiments, in a projection plane orthogonal to the thickness direction of the negative electrode starting segment, a projection of at least a portion of the blocking member coincides with a projection of the negative electrode starting segment.
[0018] In some embodiments, the separator includes a separator starting section, the separator starting section exceeds the positive electrode starting section, and the separator starting section is wound around the circumference of the winding center for at least one circle.
[0019] A battery according to another embodiment of the present invention comprises the winding core described in any one of the embodiments of the present invention.
[0020] According to the battery of the embodiment of the utility model, the negative electrode starting section and the positive electrode starting section are both located in the straight area, and the negative electrode starting section and the positive electrode starting section are respectively arranged on opposite sides of the winding center, thereby making the thickness of the position of the core adjacent to the winding center uniform, so as to avoid the problem of lithium deposition caused by excessive local stress in the negative electrode starting section and the positive electrode starting section. It can be understood that when the core is wound, the positive electrode starting section exceeds the negative electrode starting section, so that the negative electrode starting section and the positive electrode starting section are arranged on opposite sides of the winding center, thereby reducing the consumables of a part of the negative electrode sheet, and ensuring that the metal ions released from the inner side of the positive electrode starting section can be embedded in the corresponding negative electrode starting section, thereby improving the energy density of the core. Therefore, the core of the embodiment of the utility model does not need to control the extension length of the negative electrode starting section in the bending area, the manufacturing process is simple, the thickness is uniform, and the problem of lithium deposition caused by excessive local stress in the negative electrode starting section and the positive electrode starting section can be avoided.
[0021] A vehicle according to another embodiment of the utility model comprises the battery described in the embodiment of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 Schematic diagram of a winding core according to an embodiment of the present invention.
[0023] Figure 2 It is a schematic diagram of a winding core according to another embodiment of the present invention.
[0024] Figure 3 It is an expanded view of the positive electrode sheet and the blocking member of the winding core of the embodiment of the utility model.
[0025] Reference numerals:
[0026] 100, winding core; 110, straight area; 120, bending area; 130, winding center;
[0027] 101, positive electrode sheet; 1011, positive electrode starting section; 1012, positive electrode bending section;
[0028] 102, negative electrode sheet; 1021, negative electrode starting section;
[0029] 103, diaphragm; 1031, diaphragm starting section;
[0030] 104. Blocking member. DETAILED DESCRIPTION
[0031] The 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 cannot be understood as limiting the present invention.
[0032] Please refer to the following Figures 1 to 3 The winding core 100 , a battery, and a vehicle according to the embodiments of the present invention are described.
[0033] like Figures 1 to 3 As shown, the winding core 100 of the embodiment of the utility model includes: a positive electrode sheet 101, a negative electrode sheet 102 and a separator 103 for separating the positive electrode sheet 101 and the negative electrode sheet 102. The positive electrode sheet 101, the negative electrode sheet 102 and the separator 103 are wound and arranged to form a straight area 110 and a bending area 120. The bending area 120 is arranged on one side of the length direction of the straight area 110. The straight area 110 has a winding center 130. The negative electrode sheet 102 includes a negative electrode starting section 1021, and the negative electrode starting section 1021 is located in the straight area 110. The positive electrode sheet 101 includes a positive electrode starting section 1011, and the positive electrode starting section 1011 is located in the straight area 110. The negative electrode starting section 1021 and the positive electrode starting section 1011 are respectively arranged on opposite sides of the winding center 130.
[0034] It should be noted that there are two bending regions 120, and the two bending regions 120 are arranged along the length direction of the straight region 110 (eg Figure 1 The separator 103 is disposed between the positive electrode sheet 101 and the negative electrode sheet 102 to prevent the positive electrode sheet 101 and the negative electrode sheet 102 from short-circuiting.
[0035] The straight area 110 refers to an area with a parallel structure in the winding core 100, that is, the positive electrode sheet 101, the negative electrode sheet 102 and the separator 103 in the straight area 110 are arranged substantially in parallel. In other words, the surfaces of the positive electrode sheet 101, the negative electrode sheet 102 and the separator 103 in the straight area 110 are all flat. The bending area 120 refers to an area with a bending structure in the winding core 100, that is, the positive electrode sheet 101, the negative electrode sheet 102 and the separator 103 in the bending area 120 are all bent. In other words, the surfaces of the positive electrode sheet 101, the negative electrode sheet 102 and the separator 103 in the bending area 120 are all curved.
[0036] The surface of the negative electrode sheet 102 has a negative electrode active material layer (not shown) composed of a negative electrode active material, and the surface of the positive electrode sheet 101 has a positive electrode active material layer (not shown) composed of a positive electrode active material. For example, the positive electrode active material may be lithium manganate, lithium cobaltate, lithium iron phosphate or lithium nickel cobalt manganate, and the negative electrode active material may be graphite or silicon.
[0037] According to the winding core 100 of the embodiment of the utility model, the negative electrode starting section 1021 and the positive electrode starting section 1011 are both located in the straight area 110, and the negative electrode starting section 1021 and the positive electrode starting section 1011 are respectively arranged on opposite sides of the winding center 130, thereby making the thickness of the position of the winding core 100 adjacent to the winding center 130 uniform, so as to avoid the problem of lithium deposition caused by excessive local stress in the negative electrode starting section 1021 and the positive electrode starting section 1011. It can be understood that when the winding core 100 is wound, the positive electrode starting section 1011 exceeds the negative electrode starting section 1021, so that the negative electrode starting section 1021 and the positive electrode starting section 1011 are arranged on opposite sides of the winding center 130, thereby reducing the consumables of a part of the negative electrode sheet 102, and ensuring that the metal ions released from the inner side of the positive electrode starting section 1011 can be embedded in the corresponding negative electrode starting section 1021, thereby improving the energy density of the winding core 100.
[0038] It can be understood that the inner side of the positive electrode starting segment 1011 (the side of the positive electrode starting segment 1011 adjacent to the winding center 130) has a positive electrode active material layer, and the inner side of the negative electrode starting segment 1021 (the side of the negative electrode starting segment 1021 adjacent to the winding center 130) has a negative electrode active material layer. Thus, the metal ions released from the inner side of the positive electrode starting segment 1011 can be embedded into the inner side of the corresponding negative electrode starting segment 1021 to ensure that the winding core 100 has a higher energy density.
[0039] The inventors discovered through experimental research that during actual production of the winding core 100 in the related art, the inner end of the negative electrode sheet 102 of the winding core 100 usually extends to the corner position of the positive electrode sheet 101. However, the extension length of the inner end of the negative electrode sheet 102 at the corner position of the positive electrode sheet 101 is difficult to control. When the extension length of the inner end of the negative electrode sheet 102 is too long, it will occupy the space in the thickness direction of the winding core 100 and may cause excessive local stress, which may easily lead to local lithium deposition problems.
[0040] The winding core 100 of the embodiment of the utility model shortens the negative electrode starting section 1021 of the negative electrode sheet 102 by a certain distance, that is, the negative electrode starting section 1021 only extends at the position of the straight area 110. Therefore, when the winding core 100 is wound, it is not necessary to control the extension length of the negative electrode starting section 1021 in the bending area 120. The manufacturing process is simple, which is conducive to reducing the thickness direction of the winding core 100 (such as Figure 1The size of the negative electrode starting section 1021 and the positive electrode starting section 1011 can be reduced, and the problem of lithium plating caused by excessive local stress in the negative electrode starting section 1021 and the positive electrode starting section 1011 can be avoided.
[0041] Optionally, the positive electrode sheet 101 also includes a positive bending section 1012, which is located in the bending area 120, and the head end of the positive bending section 1012 is connected to the tail end of the positive starting section 1011, and the head end of the negative starting section 1021 is arranged adjacent to the tail end of the positive bending section 1012. It should be noted that the "head end" refers to the starting end when the core 100 is wound, and the "tail end" refers to the tail end when the core 100 is wound. Since the head end of the negative starting section 1021 is arranged adjacent to the tail end of the positive bending section 1012, the length of the negative starting section 1021 is extended as much as possible in the straight area 110 to improve the energy density of the core 100 without occupying the space in the thickness direction of the core 100.
[0042] like Figure 1 As shown, the extension length of the positive electrode starting segment 1011 in the straight region 110 is equal to the extension length of the negative electrode starting segment 1021 in the straight region 110. It can be understood that the length of the positive electrode starting segment 1011 in the A direction is equal to the length of the negative electrode starting segment 1021 in the A direction. In this way, the number of lithium ions that can be provided by the lithium insertion site of the negative electrode active material layer of the negative electrode starting segment 1021 and the positive electrode starting segment 1011 can be basically the same, which can reduce or avoid the occurrence of lithium precipitation and improve the energy density of the core 100.
[0043] In some embodiments, the winding core 100 further includes a blocking member 104, which is disposed in the bending area 120 and adjacent to the positive electrode bending section 1012, and the blocking member 104 is used to block the positive electrode bending section 1012 from escaping metal ions. For example, the metal ions may be lithium ions, sodium ions or other metal ions. It is understandable that the head end of the negative electrode starting section 1021 is wrapped by the positive electrode bending section 1012, so that the positive and negative electrode balance coefficient of the lithium-ion battery at the head end of the negative electrode sheet 102 is less than 1, thereby causing lithium ions to aggregate at the head end of the negative electrode sheet 102 and the risk of lithium precipitation. The winding core 100 of an embodiment of the utility model can block the escape of lithium ions in the corner area of the positive electrode by arranging a blocking member 104 in the area of the positive electrode bending section 1012, thereby avoiding the accumulation of lithium ions at the head end of the negative electrode sheet 102 and the risk of lithium precipitation.
[0044] Optionally, the blocking member 104 is disposed on the inner side of the positive electrode bending section 1012. It can be understood that the blocking member 104 is disposed on a side of the positive electrode bending section 1012 adjacent to the winding center 130. Alternatively, the blocking member 104 is disposed on the diaphragm 103 corresponding to the inner side of the positive electrode bending section 1012. Alternatively, the blocking member 104 can be disposed on both the inner side of the positive electrode bending section 1012 and the diaphragm 103 corresponding to the inner side of the positive electrode bending section 1012. This can greatly reduce the probability of lithium ions escaping from the positive electrode bending section 1012, and avoid the risk of lithium ion aggregation and lithium precipitation at the head end of the negative electrode starting section 1021.
[0045] In one example, the blocking member 104 is a tape, which is bonded to the inner side of the positive electrode bending section 1012, and the porosity of the tape is less than the porosity of the separator 103. This makes it easy to process and manufacture the winding core 100, and the structural design is simple and the cost is low. For example, the tape is a corrosion-resistant tape to extend the service life of the tape.
[0046] On the other hand, since the tape is bonded to the inner side of the positive bending section 1012, the tape can support the positive bending section 1012 to reduce the problem of local stress concentration caused by the excessive bending angle of the positive bending section 1012.
[0047] Optionally, the head end of the blocking member 104 extends into the straight region 110 and extends along the length direction of the positive electrode starting segment 1011, and the tail end of the blocking member 104 extends into the straight region 110 and extends along the length direction of the negative electrode starting segment 1021. It can be understood that both the head end and the tail end of the blocking member 104 exceed the bending region 120 and extend into the straight region 110, thereby further reducing the risk of lithium ion aggregation and lithium deposition at the head end of the negative electrode starting segment 1021.
[0048] For example, in a projection plane orthogonal to the thickness direction of the negative electrode starting segment 1021, the projection of at least part of the blocking member 104 overlaps with the projection of the negative electrode starting segment 1021. It can be understood that the blocking member 104 and the negative electrode starting segment 1021 overlap in the thickness direction of the winding core 100, so that the blocking member 104 can wrap the head end of the negative electrode starting segment 1021, thereby reducing the risk of lithium ion aggregation and lithium deposition at the head end of the negative electrode starting segment 1021.
[0049] In some embodiments, the separator 103 includes a separator starting section 1031, the separator starting section 1031 exceeds the positive electrode starting section 1011, and the separator starting section 1031 is wound at least once around the circumference of the winding center 130. It is understandable that the separator starting section 1031 can be wound one or more times around the circumference of the winding center 130. When the winding core 100 is wound, the separator starting section 1031 will be clamped between the positive electrode starting section 1011 and the negative electrode starting section 1021. On the one hand, the separator starting section 1031 can insulate the positive electrode starting section 1011 and the negative electrode starting section 1021 to avoid the problem of short circuit between the positive electrode starting section 1011 and the negative electrode starting section 1021. On the other hand, since the diaphragm starting segment 1031 can be wound several times around the circumference of the winding center 130, the curvature radius of the positive electrode starting segment 1011 and the negative electrode starting segment 1021 when winding can be reduced. In other words, the diaphragm starting segment 1031 has a certain supporting effect on the positive electrode starting segment 1011 and the negative electrode starting segment 1021, so as to reduce the stress concentration problem of the positive electrode starting segment 1011 and the negative electrode starting segment 1021, which is beneficial to extend the service life of the core 100.
[0050] A battery according to another embodiment of the present invention comprises the winding core 100 according to the present invention. The technical advantages of the battery according to the present embodiment of the present invention are the same as those of the winding core 100 according to the above embodiment, and will not be described in detail here.
[0051] A vehicle according to another embodiment of the present invention comprises the battery according to the embodiment of the present invention. The technical advantages of the vehicle according to the embodiment of the present invention are the same as the technical advantages of the battery according to the above embodiment, which will not be described in detail here.
[0052] In the description of the present invention, it should 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 a limitation on the present invention.
[0053] 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 utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0054] 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.
[0055] In the present utility model, 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.
[0056] In the present utility model, 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 utility model. 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.
[0057] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.
Claims
1. A winding core (100), characterized in that: include: A positive electrode sheet (101), a negative electrode sheet (102), and a separator (103) for separating the positive electrode sheet (101) and the negative electrode sheet (102); the positive electrode sheet (101), the negative electrode sheet (102), and the separator (103) are arranged in a coiled manner to form a straight region (110) and a bending region (120); the bending region (120) is arranged on one side of the straight region (110) in a longitudinal direction; and the straight region (110) has a coiling center (130); The negative electrode sheet (102) comprises a negative electrode starting section (1021), and the negative electrode starting section (1021) is located in the straight area (110); the positive electrode sheet (101) comprises a positive electrode starting section (1011), and the positive electrode starting section (1011) is located in the straight area (110); the negative electrode starting section (1021) and the positive electrode starting section (1011) are respectively arranged on opposite sides of the winding center (130).
2. The winding core (100) according to claim 1, characterized in that: The positive electrode sheet (101) further comprises a positive electrode bending section (1012), wherein the positive electrode bending section (1012) is located in the bending area (120), the head end of the positive electrode bending section (1012) is connected to the tail end of the positive electrode starting section (1011), and the head end of the negative electrode starting section (1021) is arranged adjacent to the tail end of the positive electrode bending section (1012).
3. The winding core (100) according to claim 1, characterized in that: The extension length of the positive electrode starting section (1011) in the straight region (110) is equal to the extension length of the negative electrode starting section (1021) in the straight region (110).
4. The winding core (100) according to claim 1, characterized in that: The positive electrode sheet (101) further comprises a positive electrode bending section (1012), the positive electrode bending section (1012) being located in the bending region (120), the head end of the positive electrode bending section (1012) being connected to the tail end of the positive electrode starting section (1011), and the winding core (100) further comprises a blocking member (104), the blocking member (104) being located in the bending region (120) and arranged adjacent to the positive electrode bending section (1012), the blocking member (104) being used to block the positive electrode bending section (1012) from escaping metal ions.
5. The winding core (100) according to claim 4, characterized in that: The blocking member (104) is arranged on the inner side surface of the positive electrode bending section (1012); and / or the blocking member (104) is arranged on the diaphragm (103) corresponding to the inner side surface of the positive electrode bending section (1012).
6. The winding core (100) according to claim 4, characterized in that: The blocking member (104) is an adhesive tape, the adhesive tape is bonded to the inner side surface of the positive electrode bending section (1012), and the porosity of the adhesive tape is smaller than the porosity of the diaphragm (103).
7. The winding core (100) according to claim 4, characterized in that: The head end of the blocking member (104) extends into the straight area (110) and extends along the length direction of the positive electrode starting section (1011), and the tail end of the blocking member (104) extends into the straight area (110) and extends along the length direction of the negative electrode starting section (1021).
8. The winding core (100) according to claim 7, characterized in that: In a projection plane orthogonal to the thickness direction of the negative electrode starting section (1021), at least a portion of the projection of the blocking member (104) coincides with the projection of the negative electrode starting section (1021).
9. The winding core (100) according to claim 1, characterized in that: The diaphragm (103) comprises a diaphragm (103) starting section, the diaphragm (103) starting section exceeds the positive electrode starting section (1011), and the diaphragm (103) starting section is wound around the winding center (130) at least once in the circumferential direction.
10. A battery, characterized in that: The winding core (100) comprises any one of claims 1 to 9.
11. A vehicle, characterized in that: Comprising the battery as claimed in claim 10.