Battery and battery device
By setting the winding tail end of the diaphragm on the curved side of the roll core, the problem of slow battery heat dissipation speed is solved, the heat dissipation efficiency and structural stability are improved, and the safety of the battery is enhanced.
Patent Information
- Application Number
- CN202323335389.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-06
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2033-12-06
AI Technical Summary
The battery's heat dissipation speed is slow, mainly due to the low thermal conductivity of the steel shell and the heat accumulation problem caused by the finishing tape covering the core.
The wound tail end of the diaphragm is arranged on the curved side of the roll core to reduce the area covered by the finishing tape, improve the heat dissipation speed, and reduce the risk of the diaphragm winding tail opening during expansion.
It effectively improves the internal heat dissipation of the battery, improves the heat dissipation speed and structural stability, and enhances the safety and stability of the battery.
Smart Images
Figure CN222300715U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery and a battery device. Background Art
[0002] In the related art, the battery includes a battery shell and a winding core located inside the battery shell. The battery shell includes steel. However, the thermal conductivity of steel is relatively low, and the heat dissipation of the battery is slow. At the same time, the winding tail of the winding core body needs to be fixed by a tail tape. The winding tail of the winding core body is generally set on the largest side of the winding core body. However, the tail tape located on the largest side of the winding core body will further affect the heat dissipation speed of the winding core body.
[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content
[0004] The utility model provides a battery, which can solve the technical problem of slow heat dissipation speed of a winding core body.
[0005] Battery Included:
[0006] a battery housing, the battery housing comprising steel;
[0007] The core includes a core body, which is located in the battery housing. The core body is formed by winding the positive and negative electrode sheets and the diaphragm. The outermost side of the core body in the stacking direction of the positive and negative electrode sheets is formed by the diaphragm. The diaphragm includes a winding tail end. The core body also includes two large faces arranged opposite to each other and a curved side face connected between the two large faces. The large face is the largest side face of the core body. The winding tail end of the diaphragm is located on the curved side face.
[0008] The tail tape is at least partially bonded to at least a portion of the wound tail end of the diaphragm and is used to fix the wound tail end of the diaphragm on the curved side.
[0009] The utility model sets the winding tail end of the diaphragm on the curved side. On the one hand, this setting can reduce the area of the large surface of the core body covered by the tail tape, thereby increasing the heat dissipation speed of the core body through the large surface. Especially when the battery shell includes steel, the thermal conductivity of the battery shell itself is low, and the heat dissipation speed of the battery is slow. The above setting can effectively improve the problem of easy accumulation of heat inside the battery; on the other hand, compared with other positions of the core body, the expansion amount of the core body at the location of the curved side is small. The utility model sets the winding tail end of the diaphragm on the curved side, thereby reducing the risk of the diaphragm winding tail end opening when the core body expands.
[0010] The utility model also provides a battery device, which includes the above-mentioned battery. The battery has good heat dissipation effect and structural stability, so that the battery device also has good safety and stability.
[0011] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.
[0013] in:
[0014] Figure 1 is a schematic structural diagram of a battery in an exemplary embodiment of the present disclosure;
[0015] Figure 2 for Figure 1 A cross-sectional view of the battery shown along dashed line AA;
[0016] Figure 3 for Figure 2 a top view of the battery shown;
[0017] Figure 4 It is a schematic structural diagram of a single winding core in an exemplary embodiment of the battery disclosed herein;
[0018] Figure 5 for Figure 4 a side view of the winding core shown;
[0019] Figure 6 A schematic diagram of the structure of all winding cores in an exemplary embodiment of the battery disclosed herein;
[0020] Figure 7 It is a schematic diagram of the structure of all winding cores in another exemplary embodiment of the battery disclosed in the present invention.
[0021] Description of reference numerals:
[0022] 1. The winding core body; 11. The large surface; 12. The curved side surface; 13. The end surface; 2. The winding tail end; 3. The closing tape; 4. The battery shell; 5. The fixing tape; 6. The tab; 7. The winding core. DETAILED DESCRIPTION
[0023] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.
[0024] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.
[0025] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.
[0026] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.
[0027] like Figure 1-6 As shown, Figure 1 is a schematic diagram of the structure of a battery in an exemplary embodiment of the present disclosure, Figure 2 for Figure 1 The battery is shown in a cross-sectional view along the dashed line AA, Figure 3 for Figure 2 A top view of the battery shown, Figure 4 This is a schematic diagram of the structure of a single winding core in an exemplary embodiment of the battery disclosed herein. Figure 5 for Figure 4 A side view of the winding core shown, Figure 6 It is a schematic diagram of the structure of all winding cores in an exemplary embodiment of the battery disclosed in the present invention.
[0028] The battery includes: a battery shell 4, a winding core 7, and a closing tape 3. The battery shell 4 includes steel, the winding core 7 includes a winding core body 1, the winding core body 1 is located in the battery shell 4, the winding core body 1 is formed by winding positive and negative electrode sheets and a diaphragm, the outermost side of the winding core body 1 in the stacking direction of the positive and negative electrode sheets is formed by the diaphragm, the diaphragm includes a winding tail end 2, the winding core body 1 also includes two large surfaces 11 arranged opposite to each other and a curved side surface 12 connected between the two large surfaces 11, the large surface 11 is the largest side surface of the winding core body 1, and the winding tail end 2 of the diaphragm is located on the curved side surface; the closing tape 3 is at least partially bonded to at least a portion of the winding tail end 2 of the diaphragm, and is used to fix the winding tail end 2 of the diaphragm on the curved side surface 12.
[0029] In this exemplary embodiment, the winding tail end 2 of the diaphragm is arranged on the curved side surface 12. On the one hand, this arrangement can reduce the area of the closing tape 3 covering the large surface 11 of the core body, thereby increasing the heat dissipation speed of the core body 1 through the large surface 11; on the other hand, compared with other positions of the core body, the expansion amount of the core body 1 at the location of the curved side surface 12 is smaller. In this exemplary embodiment, the winding tail end 2 of the diaphragm is arranged on the curved side surface 12, thereby reducing the risk of the diaphragm winding tail end 2 opening when the core body expands.
[0030] In this exemplary embodiment, Figure 1-6 As shown, the closing tape 3 can be located only on the curved side surface 12, and this arrangement can greatly reduce the effect of the closing tape 3 on the heat dissipation of the core body 1. It should be understood that in other exemplary embodiments, the closing tape 3 can also extend to other sides of the core body 1, for example, the closing tape 3 can also extend to the large surface 11 of the core body and / or the end surface 13 of the core body 1 opposite to the winding axis.
[0031] In this exemplary embodiment, Figure 1-6 As shown, the battery further includes: a battery housing 4, and the winding core body 1 is located in the battery housing 4. Figure 1-6 As shown, the battery may include two winding cores 7, and the two winding cores 7 are distributed in the thickness direction of the winding core body 1. It should be understood that in other exemplary embodiments, other numbers of winding cores 7 may be provided in the battery housing 4, for example, the number of winding cores 7 in the battery housing may be 1, 3, 4, etc.
[0032] In this exemplary embodiment, Figure 1-6 As shown, the battery may include a plurality of winding cores 7, and the plurality of winding cores 7 are distributed in the thickness direction of the winding core body. The battery also includes: a fixing tape 5, the fixing tape 5 is at least partially bonded to the curved side surface 12 of the plurality of winding core bodies 1 on the same side, and the fixing tape 5 is used to fix the plurality of winding cores 7 into one; wherein the fixing tape 5 covers at least a portion of the closing tape 3. Figure 1-6As shown, the fixing tape 5 can be bonded to the curved side surface 12 and the large surface 11 connected to the curved side surface 12. In this exemplary embodiment, the fixing tape 5 is bonded to the end tape 3, so that the fixing strength of the end tape 3 to the membrane winding tail end 2 can be enhanced.
[0033] like Figure 7 , which is a schematic diagram of the structure of all the cores in another exemplary embodiment of the battery disclosed in the present invention. The fixing tape 5 can cover the area outside the closing tape 3. In this exemplary embodiment, the fixing tape 5 covers the area outside the closing tape 3, and this setting can reduce the difficulty of disassembling the core.
[0034] like Figure 1-7 As shown, the winding axis of the core body 1 is the straight line direction parallel to the positive and negative electrode sheets when the positive and negative electrode sheets are wound. The core body 1 may include a thickness direction Z, a height direction Y, and a length direction X. The core body 1 may include two curved side surfaces 12 arranged opposite to each other. The two curved side surfaces 12 are arranged opposite to each other in the length direction X of the core body 1. The height direction Y of the core body 1 is the winding axis of the core body 1. The thickness direction Z, the height direction Y, and the length direction X of the core body are perpendicular to each other, and the thickness of the core body 1 is less than the length and height of the core body 1.
[0035] In this exemplary embodiment, Figure 1-7 As shown, the ratio of the area of the end tape 3 to the thickness of the core body 1 is 5mm-100mm. For example, the ratio of the area of the end tape 3 to the thickness of the core body 1 can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 100mm, etc. If the ratio of the area of the end tape 3 to the thickness of the core body 1 is too small, the thickness of the core body is too large, the expansion of the core body during charging and discharging is large, and the end tape 3 is easy to be torn; if the ratio of the area of the end tape 3 to the thickness of the core body 1 is too large, the area of the end tape 3 is too large, and the electrolyte between the curved side 12 and the battery shell 4 is not easy to enter the core body, which may lead to problems such as untimely replenishment of electrolyte in the core body 1 and lithium deposition of the negative electrode sheet. In this exemplary embodiment, the ratio of the area of the closing tape 3 and the thickness of the core body 1 is set to a suitable size. This setting can not only reduce the risk of the closing tape 3 being torn, but also increase the speed of replenishing the electrolyte in the core body, thereby improving the problem of easy lithium deposition of the negative electrode sheet at the curved side position.
[0036] In this exemplary embodiment, Figure 1-7As shown, the core body 1 includes two curved side surfaces 12 arranged opposite to each other, and the two curved side surfaces 12 are arranged opposite to each other in the length direction X of the core body 1. The ratio of the length L1 of the core body 1 to the dimension L2 of the battery housing 4 in the length direction X of the core body 1 is greater than or equal to 0.85 and less than 1. For example, L1 / L2 can be equal to 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, etc. If L1 / L2 is too large, the distance between the curved side surface 12 and the battery housing is too small, and the tail tape 3 is easily damaged by the battery housing; if L1 / L2 is too small, the capacity of the battery is too small. In this exemplary embodiment, L1 / L2 is set to a suitable size, which can reduce the risk of damage to the tail tape 3 and ensure the capacity of the battery.
[0037] In this exemplary embodiment, Figure 1-7 As shown, the thickness of the side walls opposite to the battery housing 4 and the curved side 12 is 0.05mm-1.5mm. For example, the thickness of the side walls opposite to the battery housing 4 and the curved side 12 can be equal to 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, etc. If the thickness of the side wall of the battery housing 4 and the curved side 12 is too small, the battery housing is easily deformed to form an angular structure, which is easy to damage the end tape 3 at the curved side 12; if the thickness of the side wall of the battery housing 4 and the curved side 12 is too large, the weight of the battery housing increases and the energy density of the battery decreases. In this exemplary embodiment, the thickness of the side wall of the battery housing 4 and the curved side 12 is set to a suitable size, which can reduce the risk of damage to the end tape 3 and ensure the energy density of the battery.
[0038] In this exemplary embodiment, Figure 1-7As shown, after the tail tape 3 is flattened along the winding axis of the core body 1, the ratio of the dimension h1 of the tail tape 3 in the winding axis of the core body 1 to the dimension h2 of the core body 1 in the winding axis is 0.05-2.5. For example, h1 / h2 can be equal to 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, 2, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.45, 2.5, etc. If h1 / h2 is too small, h1 is too small, a large part of the winding tail end 2 of the diaphragm is not covered by the tail tape 3, and there is a risk of folding of the winding tail end 2 of the diaphragm. The folding of the winding tail end 2 will cause the pole piece to be exposed outside the diaphragm, which can easily cause a short circuit between the pole piece and other structures such as the battery shell; if h1 / h2 is too large, h1 is too large, and the electrolyte between the core body and the battery shell 4 is not easy to enter the core body, which may cause problems such as untimely replenishment of electrolyte in the core body and lithium deposition of the negative electrode sheet. In this exemplary embodiment, h1 / h2 is set to a suitable size, which can reduce the risk of folding of the winding tail end 2 of the diaphragm, and at the same time increase the speed of replenishing electrolyte in the core body.
[0039] It should be noted that the end tape 3 can extend to two end surfaces 13 of the core body 1 that are oppositely arranged in the winding axis direction. When the end tape 3 extends to the end surfaces 13, h1 / h2 can be greater than 1.
[0040] In this exemplary embodiment, Figure 1-7 As shown, the distance h3 between the side of the closing tape 3 close to the bottom of the core body 1 and the bottom of the core body 1 is 0-100 mm, for example, h3 can be equal to 0, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, etc. This arrangement facilitates the electrolyte at the bottom of the battery to infiltrate the bottom of the core body 1.
[0041] In this exemplary embodiment, Figure 1-7 As shown, the battery can be a quadrangular prism battery. A quadrangular prism battery mainly refers to a battery having a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.
[0042] In this exemplary embodiment, the battery is any one of a lithium iron phosphate battery, a nickel cobalt manganese ternary battery, and a manganese iron lithium battery. The positive electrode active material layer in the lithium iron phosphate battery uses lithium iron phosphate as the main positive electrode material, and can also be doped with other materials such as nickel cobalt manganese, ternary materials, or manganese iron lithium materials. The positive electrode active material layer in the nickel cobalt manganese ternary battery uses nickel cobalt manganese ternary materials as the main positive electrode material, and can also be doped with other materials such as lithium iron phosphate, manganese iron lithium phosphate, etc. The positive electrode active material layer in the manganese iron lithium battery uses manganese iron lithium material as the main positive electrode material, and can also be doped with other materials such as lithium iron phosphate, ternary materials, etc.
[0043] In this exemplary embodiment, the battery housing 4 may be a steel shell.
[0044] In this exemplary embodiment, Figure 1-7 As shown, the winding core 7 may also include a pole ear 6. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer located on at least one side of the positive electrode current collector, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer located on at least one side of the negative electrode current collector. The positive electrode active material of the lithium-ion battery may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium iron manganese, etc. The negative electrode active material may be graphite, silicon, etc. The pole ear includes a positive pole ear and a negative pole ear. The positive pole ear is connected to the positive electrode current collector in the positive electrode sheet. For example, the positive pole ear can be formed by cutting the positive electrode current collector material layer; the negative pole ear is connected to the negative electrode current collector in the negative electrode sheet. For example, the negative pole ear can be formed by cutting the negative electrode current collector material layer. During charging, lithium ions are separated from the positive electrode active material, move to the negative electrode active material through the electrolyte, and the lithium ions are embedded in the interlayer gaps of the carbon material to complete the charging process of the battery. During discharge, lithium ions are separated from the negative electrode active material, move to the positive electrode active material through the electrolyte, and complete the discharge process of the battery.
[0045] The separator in the battery is used to separate the positive electrode and the negative electrode. The separator can allow ions to pass through while blocking electrons. The separator can be a polyethylene film, a polypropylene film, etc.
[0046] In this exemplary embodiment, the battery device is a battery module or a battery pack.
[0047] The battery module includes a plurality of batteries, and the batteries may be quadrangular prism batteries. The battery module may further include end plates and side plates, and the end plates and side plates are used to fix the plurality of batteries.
[0048] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.
[0049] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.
[0050] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.
[0051] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.
[0052] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims
1. A battery, characterized in that: The battery comprises: A battery housing (4), the battery housing (4) comprising steel; A winding core (7), the winding core (7) comprising a winding core body (1), the winding core body (1) being located in the battery housing (4), the winding core body (1) being formed by winding positive and negative electrode sheets and a separator, the outermost side surface of the winding core body (1) in the stacking direction of the positive and negative electrode sheets being formed by the separator, the separator comprising a winding tail end (2), the winding core body (1) further comprising two large surfaces (11) arranged opposite to each other and a curved side surface (12) connected between the two large surfaces (11), the large surface (11) being the largest side surface of the winding core body (1), and the winding tail end (2) of the separator being located on the curved side surface; The tail tape (3) is at least partially bonded to at least a portion of the wound tail end (2) of the diaphragm, and is used to fix the wound tail end (2) of the diaphragm on the curved side surface (12).
2. The battery according to claim 1, characterized in that The ratio of the area of the tail tape (3) to the thickness of the winding core body (1) is 5 mm-100 mm.
3. The battery according to claim 1, characterized in that The winding core body (1) comprises two curved side surfaces (12) arranged opposite to each other, the two curved side surfaces (12) being arranged opposite to each other in the length direction of the winding core body (1), and the ratio of the length of the winding core body (1) to the dimension of the battery housing (4) in the length direction of the winding core body (1) is greater than or equal to 0.85 and less than 1.
4. The battery according to claim 1, characterized in that The battery comprises a plurality of winding cores (7), wherein the plurality of winding cores (7) are distributed in the thickness direction of the winding core body (1); The battery also includes: A fixing tape (5) is at least partially bonded to the curved side surface (12) of the plurality of winding core bodies (1) located on the same side, and the fixing tape (5) is used to fix the plurality of winding cores (7) into one body; Wherein, the fixing tape (5) covers at least a portion of the finishing tape (3).
5. The battery according to claim 1, characterized in that The battery comprises a plurality of winding cores (7), wherein the plurality of winding cores (7) are distributed in the thickness direction of the winding core body (1); The battery also includes: A fixing tape (5) is at least partially bonded to the curved side surface (12) of the plurality of winding core bodies (1) located on the same side, and the fixing tape (5) is used to fix the plurality of winding cores (7) into one body; Wherein, the fixing tape (5) covers the area outside the finishing tape (3).
6. The battery according to claim 1, characterized in that The thickness of the side walls of the battery housing (4) and the curved side surface (12) opposite to each other is 0.05 mm to 1.5 mm.
7. The battery according to claim 1, characterized in that After the tail tape (3) is flattened along the winding axis of the core body (1), the ratio of the size of the tail tape (3) in the winding axis of the core body (1) to the size of the core body (1) in its winding axis is 0.05-2.
5.
8. The battery according to claim 1, characterized in that The distance between the side of the finishing tape (3) close to the bottom of the core body (1) and the bottom of the core body (1) is 0-100 mm.
9. The battery according to any one of claims 1 to 8, characterized in that: The battery is a quadrangular prism battery.
10. The battery according to any one of claims 1 to 8, characterized in that: The battery is any one of a lithium iron phosphate battery, a nickel cobalt manganese battery, and a manganese iron lithium battery.
11. A battery device, characterized in that: The battery device comprises the battery according to any one of claims 1 to 10.