Battery and electric equipment

Abstract

The utility model provides a battery and electric equipment. The battery comprises a shell, a battery cell and a protection element, the battery cell is located in the shell, the battery cell is provided with a tab, a top sealing edge is formed on one side of the shell, and the tab extends out of the top sealing edge; the protection element is connected with the tab, and at least part of the protection element is located on one side of the top sealing edge; and the protection element comprises an element main body and a temperature sensing part, and the temperature sensing part is positioned on one side, deviating from the top sealing edge, of the element main body, so that the energy density of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery and an electrical device. Background Technology

[0002] Currently, lithium-ion batteries are widely used not only in portable electronic devices such as mobile phones and laptops, but also in electric vehicles, electric bicycles and other electric equipment.

[0003] A battery consists of a cell and a casing that surrounds the cell. To improve battery safety, related technologies incorporate protective components such as temperature switches. For example, when the battery temperature is high, the heat is conducted to the temperature switch, which then activates, stopping the battery from operating. However, these related technologies suffer from low energy density, failing to meet battery performance requirements. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery and electrical device to improve the energy density of the battery.

[0005] In a first aspect, this utility model provides a battery, including a casing, a cell, and a protective element;

[0006] The battery cell is located inside the housing, the battery cell has a tab, a top sealing edge is formed on one side of the housing, and the tab extends from the top sealing edge;

[0007] The protective element is electrically connected to the tab, and at least a portion of the protective element is located on one side of the top seal edge; the protective element includes an element body and a temperature sensing element, the temperature sensing element being located on the side of the element body opposite to the top seal edge.

[0008] Optionally, along the height direction of the battery, the upper edge of the top seal is not higher than the upper edge of the temperature sensing element;

[0009] And / or, along the width direction of the battery, the distance Z between the temperature sensing element and the top sealing edge satisfies: 0.5mm≤Z≤3mm.

[0010] Optionally, the battery further includes a first thermally conductive layer;

[0011] The first thermally conductive layer makes thermal contact with both the temperature sensing element and the electrode tab.

[0012] Alternatively, the battery may further include an adapter connected between the protective element and the tab, wherein the first thermally conductive layer makes thermal contact with at least one of the tab and the adapter, and the temperature sensing element.

[0013] Optionally, an adhesive layer is provided between the protective element and the top sealing edge, and the adhesive layer is bonded to both the protective element and the top sealing edge.

[0014] Optionally, along the height direction of the battery, the upper edge of the adhesive layer is not higher than the upper edge of the top seal edge;

[0015] And / or, the adhesive layer is a double-sided colloid;

[0016] And / or, the total height H of the adhesive layer in the height direction of the battery and the total height h of the component body in the height direction of the battery satisfy: 1 / 3h ≤ H < h.

[0017] Optionally, the battery further includes a second thermally conductive layer disposed between the protective element and the top sealing edge;

[0018] The second thermally conductive layer is in thermal contact with at least one of the top sealing edge and the tab; or, the battery further includes an adapter connected between the protective element and the tab, wherein the second thermally conductive layer is in thermal contact with at least one of the tab, the adapter, and the top sealing edge.

[0019] Optionally, an adhesive layer is further provided between the protective element and the top sealing edge;

[0020] The second thermally conductive layer and the adhesive layer are an integral structure, or the second thermally conductive layer is connected between the adhesive layer and the protective element.

[0021] Optionally, the operating temperature range of the temperature sensing element is 55℃~85℃.

[0022] Optionally, the battery further includes an insulating layer;

[0023] The insulating layer covers at least the side of the temperature sensing element opposite to the top sealing edge.

[0024] Optionally, the outer contour of the temperature sensing element projected along the width direction of the battery is located inside the area enclosed by the outer contour of the insulating layer projected along the width direction of the battery.

[0025] And / or, the insulating layer includes a substrate layer and an adhesive layer disposed on the substrate layer facing the temperature sensing element;

[0026] And / or, the connection between the protective element and the electrode is covered with an insulating protective layer, and the insulating layer also covers at least a portion of the insulating protective layer;

[0027] And / or, the battery includes two adapters, which are respectively connected to both ends of the protective element along the length of the battery. The protective element is connected to the tab through one of the adapters, and the connection between the two adapters and the protective element is covered with a protective adhesive layer.

[0028] The insulating layer also covers at least a portion of the protective adhesive layer.

[0029] Optionally, the top sealing edge includes two opposing top sealing portions, each of which sequentially includes a heat-sealing layer, an aluminum layer located outside the heat-sealing layer, and a protective layer located outside the aluminum layer, and the two top sealing portions are connected as one unit through the two heat-sealing layers.

[0030] Secondly, this utility model provides an electrical device, including the battery described above.

[0031] The battery and electrical device provided by this utility model connects the protective element to the electrode tab, with at least a portion of the protective element located on one side of the top seal edge. The protective element includes a main body and a temperature sensing element. By placing the temperature sensing element on the side of the main body away from the top seal edge, the temperature sensing element is separated from the top seal edge. Compared to solutions where the temperature sensing element is placed facing the top seal edge, resulting in the top seal edge being higher than the temperature sensing element to cover it and prevent short circuits caused by contact with other components, this utility model does not require the top seal edge to be higher than the temperature sensing element. This allows for more flexible setting of the top seal edge height, free from constraints imposed by the temperature sensing element, thus facilitating a reduction in the top seal edge height. While maintaining the overall outer contour of the battery, the height of the inner cavity of the casing is relatively increased, thereby increasing the space occupied by the battery cell and improving the energy density of the cell. In other words, while ensuring the safety protection of the battery by the protective element, the energy density of the cell is improved, which in turn improves the energy density of the battery. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the front structure of a battery according to an embodiment of the present invention;

[0033] Figure 2 This is an exploded view of the battery according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the back structure of a battery according to an embodiment of the present invention;

[0035] Figure 4 This is a front structural diagram of the protective element and adapter of the battery according to an embodiment of the present invention;

[0036] Figure 5This is a schematic diagram of the structure of the protective element, the adapter, and the first heat-conducting layer of the battery according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the back structure of the protective element and adapter of the battery according to an embodiment of the present invention;

[0038] Figure 7 To be Figure 6 A schematic diagram of the structure after the protective adhesive layer has been removed;

[0039] Figure 8 for Figure 1 Sectional view along line AA in the middle;

[0040] Figure 9 This is a partial structural cross-sectional view of a battery according to an embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of the structure of a battery with the top of the top seal not connected together, according to an embodiment of the present invention.

[0042] The components are as follows: 1. Housing; 11. Top sealing edge; 110. Top sealing part; 111. Heat sealing layer; 112. Aluminum layer; 113. Protective layer; 2. Battery cell; 21. Electrode; 3. Protective element; 31. Element body; 310. Adapter part; 32. Temperature sensing element; 33. Protective adhesive layer; 301. First contact element; 302. Second contact element; 4. Adhesive layer; 5. Insulating layer; 6. Insulating protective layer; 7. First thermally conductive layer; 8. Second thermally conductive layer. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0044] A battery consists of a casing and a cell. The casing encloses the cell, and the cell has tabs. A top seal is formed on one side of the casing, and the tabs extend from the top seal.

[0045] To improve battery safety, protective components such as temperature switches are installed on the battery. These components are connected to the tabs and are mounted on the top seal. The temperature switch, for example, includes a temperature-sensing plate that senses the battery temperature. When the battery temperature is high, the temperature is conducted to the temperature switch, causing it to activate, for example, by disconnecting the circuit and stopping the battery from operating. This avoids risks such as battery bulging or combustion caused by excessively high battery temperature or excessive current under extreme conditions. However, the energy density of batteries using this technology does not meet the requirements.

[0046] Based on this, the present invention provides a battery and an electrical device. By setting the temperature sensing element for sensing the battery temperature in the protection element on the side of the protection element away from the top seal edge and is isolated from the top seal edge, the height dimension of the top seal edge of the housing is not limited by the height of the temperature sensing element, making the height dimension of the top seal edge more flexible. By reducing the height dimension of the top seal edge, the space inside the housing cavity is relatively increased, that is, the space where the battery cell is located is increased, which is conducive to improving the energy density of the battery cell, and thus improving the energy density of the battery.

[0047] The battery and electrical device provided by this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments:

[0048] Reference Figures 1 to 10 As shown, this embodiment provides a battery, which may be a lithium-ion battery, specifically a polymer pouch battery.

[0049] Batteries can be used as power sources or energy storage units for electrical devices, including but not limited to mobile devices (mobile phones, laptops, tablets, etc.) and electric vehicles (such as pure electric vehicles, hybrid electric vehicles, electric bicycles, etc.).

[0050] For ease of explanation, refer to Figures 1 to 10 As shown, in this exemplary embodiment of the present invention, the X direction is defined as the length direction of the battery, the Y direction is defined as the width direction of the battery, and the Z direction is defined as the height direction of the battery.

[0051] The battery provided in this embodiment includes: a casing 1, a battery cell 2, and a protective element 3.

[0052] The battery cell 2 is located inside the housing 1 and has tabs 21. A top sealing edge 11 is formed on one side of the housing 1, and the tabs 21 extend from the top sealing edge 11. Specifically, the top sealing edge 11 extends from the top surface of the housing 1. For example, the battery cell 2 has two tabs 21, and both tabs 21 can extend from the top sealing edge 11 to the outside of the housing 1. For example, one tab 21 is a positive tab, and the other tab 21 is a negative tab.

[0053] The protective element 3 is electrically connected to the tab 21 and is used to connect to external electrical equipment to realize the transfer of the battery cell 2. At least part of the protective element 3 is located on one side of the top sealing edge 11.

[0054] The protection element 3 can be used to protect the battery cell 2 from damage or combustion risks caused by abnormal conditions such as overheating and overcurrent. The protection element 3 can be, for example, a temperature switch (thermal cut-off, also known as a thermal fuse or thermal circuit breaker), which can stop the battery from working when the battery temperature is too high.

[0055] For example, the protective element 3 may include an element body 31, a first contact 301, and a second contact 302. One end of the first contact 301 may be connected to the tab 21, and the other end of the first contact 301 may be connected to the element body 31. A portion of the first contact 301 may be formed as a temperature sensing element 32.

[0056] One end of the second contact 302 can be connected to an external electrical device, and the other end of the second contact 302 can be detachably connected to the first contact 301.

[0057] The temperature of the battery is sensed by the temperature sensing element 32. When the battery temperature is high or the overcurrent is large, the protection element 3 will activate to disconnect the circuit, such as separating the second contact 302 from the first contact 301, thereby providing protection against overheating and overcurrent and improving the safety of the battery.

[0058] Reference Figures 4 to 7 As shown, exemplarily, in a specific implementation, the battery may include an adapter portion 310. For example, there are two adapter portions 310, which are respectively disposed at both ends of the protection element 3 along the length direction of the battery. The adapter portions 310 can be connected to the ends of the protection element 3 by means of welding or the like. The protection element 3 is specifically connected to one of the tabs 21 through one of the adapter portions 310. Specifically, for example, the first contact 301 is connected to one of the tabs 21 (e.g., the negative tab) through one of the adapter portions 310, and the second contact 302 is electrically connected to an external electrical device through the other adapter portion 310.

[0059] Reference Figure 4 and Figure 6 As shown, in order to prevent the connection between the adapter 310 and the protective element 3 from contacting the housing 1 or other components, a protective adhesive layer 33 (such as solder joint protective adhesive) can be covered at the connection between the adapter 310 and the protective element 3 to provide insulation protection for the connection.

[0060] In practice, after connecting one of the adapters 310 to one of the tabs 21 (e.g., the negative tab), the negative tab needs to be folded back to the top of the battery. When the negative tab is bent downwards, the protective element 3 flips over and is located on one side of the top seal edge 11.

[0061] To prevent short circuits caused by contact between the junction of the adapter 310 and the electrode 21 and the top sealing edge 11 after the electrode tab 21 is folded back, please refer to... Figures 1 to 3 As shown, an insulating protective layer 6 can also be placed at the connection between the adapter 310 and the tab 21. The insulating protective layer 6 can be, for example, insulating tape. This not only provides insulation protection at the connection but also eliminates the need for other media to fix the insulating protective layer 6. Of course, the insulating protective layer 6 can also be an insulating coating, and the connection method is not limited to adhesive bonding.

[0062] Of course, one of the aforementioned adapters 310 can also be connected to the positive tab to achieve the connection between the protection element 3 and the tab.

[0063] In other implementations, the adapter 310 may be omitted, allowing the protective element 3 to be directly connected to the tab 21 and external electrical equipment. When the protective element 3 is directly connected to the tab 21, the aforementioned insulating protective layer 6 covers the connection point between the protective element 3 and the tab 21.

[0064] Since at least part of the protective element 3 is located on one side of the top seal edge 11, considering that if the temperature sensing element is placed on the side of the element body facing the top seal edge, in this case, if the top seal edge is too low, that is, if the height of the top seal edge is too short, the temperature sensing element may be exposed, posing a risk of short circuits and corrosion due to easy contact between the temperature sensing element and other components such as the tabs and the casing. Therefore, the height of the top seal edge needs to be set higher to cover the temperature sensing element and prevent it from contacting other components. However, if the height of the top seal edge is increased, the internal space of the casing will be relatively reduced while the outer contour size of the battery remains unchanged. That is, the space where the cell is located will be reduced, resulting in a decrease in the energy density of the cell, and thus a lower battery energy density, which cannot meet the battery performance requirements.

[0065] Therefore, in the battery provided in this embodiment, the temperature sensing element 32 is disposed on the side of the element body 31 away from the top sealing edge 11.

[0066] In other words, by isolating the temperature sensing element 32 from the top sealing edge 11, the height of the top sealing edge 11 is no longer restricted by the temperature sensing element 32. There is no need for the height of the top sealing edge 11 to be higher than the temperature sensing element 32, thus allowing for flexible design of the height of the top sealing edge 11. This helps to reduce the height of the top sealing edge 11. In this way, while keeping the overall outer contour of the battery unchanged, the height of the inner cavity of the casing 1 is relatively increased due to the reduction in the height of the top sealing edge 11, thereby increasing the space where the battery cell 2 is located and improving the energy density of the battery cell 2.

[0067] Since at least part of the protection element 3 is located on one side of the top seal edge 11, the protection element 3 is connected to the tab 21, and the temperature sensing element 32 is located on one side of the element body 31 of the protection element 3, the temperature sensing element 32 can still sense the temperature of the battery so that when the battery temperature is high, such as when the battery is overheated or overcurrent, the protection element 3 can cut off the circuit in time, thereby protecting the battery from overheating and overcurrent and improving the safety of the battery.

[0068] For example, the temperature sensing element 32 may be a temperature-sensitive metal sheet.

[0069] For example, in combination Figure 2 and Figure 8 As shown, a receiving groove can also be provided on the side of the component body 31 away from the top sealing edge 11. The receiving groove is recessed towards the top sealing edge 11, and the temperature sensing element 32 is specifically located in the receiving groove. This not only protects and positions the temperature sensing element 32 to a certain extent, but also reduces the horizontal distance between the temperature sensing element 32 and the top sealing edge 11, further improving the temperature sensing accuracy of the temperature sensing element 32.

[0070] The battery provided in this embodiment connects the protection element 3 to the tab 21. At least part of the protection element 3 is located on one side of the top sealing edge 11. The protection element 3 includes an element body 31 and a temperature sensing element 32. By setting the temperature sensing element 32 on the side of the element body 31 away from the top sealing edge 11, the temperature sensing element 32 is separated from the top sealing edge 11. Compared with the solution where the temperature sensing element is set towards the top sealing edge, resulting in the height of the top sealing edge being higher than the height of the temperature sensing element to cover the temperature sensing element and prevent the temperature sensing element from being exposed and coming into contact with other components, causing a short circuit, etc., the present invention has this design. The top sealing edge 11 does not need to be higher than the temperature sensing element 32. This makes the height of the top sealing edge 11 more flexible and not restricted by the temperature sensing element 32. This helps to reduce the height of the top sealing edge 11. With the overall outer contour of the battery unchanged, the height of the inner cavity of the casing 1 can be relatively increased, which increases the space where the cell 2 is located. This helps to increase the energy density of the cell 2. In other words, while realizing the safety protection of the battery by the protection element 3, the energy density of the cell 2 is improved, thereby improving the energy density of the battery.

[0071] Continue to refer to Figure 1 and Figure 2 As shown, in some embodiments, the battery further includes an insulating layer 5, which at least covers the side of the temperature sensing element 32 away from the top seal edge 11.

[0072] Since the temperature sensing element 32 is away from the top seal edge 11, in order to avoid the risk of short circuit caused by accidental contact between the temperature sensing element 32 and other components, the temperature sensing element 32 is insulated and protected by the insulation layer 5. This prevents the temperature sensing element 32 from contacting other components such as the electrode tab and the casing 1, thus avoiding the risk of short circuit, corrosion, etc., while improving the battery energy density and further improving the battery safety.

[0073] In some embodiments, the insulating layer 5 includes a substrate layer and an adhesive layer disposed on the side of the substrate layer facing the temperature sensing element 32.

[0074] In this way, while the insulation layer 5 provides insulation protection for components such as the temperature sensing element 32, it also achieves the connection and fixation between the insulation layer 5 and components such as the temperature sensing element 32. There is no need to set up other media to fix the insulation layer 5, which improves the convenience of operation.

[0075] Reference Figures 1 to 3 As shown, in some embodiments, the insulating layer 5 can also cover at least part of the above-mentioned insulating protective layer 6, so that the insulating layer 5 also plays a role in reinforcing the insulating protective layer 6, further improving the insulation protection effect at the connection between the protective element 3 and the tab 21. In addition, it increases the coverage area of ​​the insulating layer 5, thereby further improving the stability of the protective element 3 and the safety of the battery.

[0076] In addition, in some embodiments, the insulating layer 5 may also cover at least part of the protective adhesive layer 33, so that the insulating layer 5 also reinforces the protective adhesive layer 33, further improving the insulation protection effect at the connection between the protective element 3 and the adapter 310. Furthermore, it further increases the coverage area of ​​the insulating layer 5, thereby further improving the stability of the protective element 3 and the safety of the battery.

[0077] Reference Figure 1 , Figure 2 and Figure 8 As shown, in some embodiments, along the height direction of the battery, the upper edge of the top seal 11 is not higher than the upper edge of the temperature sensing element 32.

[0078] In other words, the height of the upper edge of the top sealing edge 11 is lower than or equal to the height of the upper edge of the temperature sensing element 32.

[0079] For example, Figure 8 The height difference d between the upper edge of the middle temperature sensing element 32 and the upper edge of the top sealing edge 11 is greater than 0.

[0080] Compared to the design where the temperature sensing element is placed on the side of the component body facing the top seal edge, this arrangement eliminates the need to consider the top seal edge 11 covering the temperature sensing element 32. Therefore, the height dimension of the top seal edge 11 (i.e., Figure 8 The height dimension of the top sealing edge 11 along the Z direction is not limited by the height of the temperature sensing element 32, which makes the height setting of the top sealing edge 11 more flexible. By ensuring that the height of the upper edge of the top sealing edge 11 is not higher than the upper edge of the temperature sensing element 32, the height dimension of the top sealing edge 11 is further reduced, thereby relatively increasing the height of the inner cavity of the housing 1, further increasing the height of the space where the battery cell 2 is located, which is conducive to improving the energy density of the battery cell 2, and thus improving the energy density of the battery.

[0081] Continue to refer to Figure 1 , Figure 2 and Figure 8 As shown, in some embodiments, the distance Z between the temperature sensing element 32 and the top sealing edge 11 along the width direction of the battery satisfies: 0.5mm≤Z≤3mm.

[0082] Reference Figure 8 As shown, the distance Z between the temperature sensing element 32 and the top sealing edge 11 specifically refers to the distance along... Figure 8 The horizontal distance in the Y direction between the side of the temperature sensing element 32 facing the top sealing edge 11 and the side of the top sealing edge 11 near the temperature sensing element 32.

[0083] For example, the distance Z can be 0.5mm, 1mm, 1.5mm, 1.75mm, 2mm, 2.5mm, or 3mm.

[0084] By setting the distance Z between the temperature sensing element 32 and the top sealing edge 11 to no more than 3mm, the distance between the temperature sensing element 32 and the top sealing edge 11 is ensured to be not too large, thus ensuring the accuracy of the temperature sensing element 32 in sensing the battery temperature and further improving the safety of the battery. At the same time, setting the distance Z between the temperature sensing element 32 and the top sealing edge 11 to no less than 0.5mm can, to a certain extent, avoid the situation where the size of the protection element 3 is too small along the battery thickness direction, which would affect the structural strength of the protection element 3. In other words, while improving the accuracy of the temperature sensing element 32 in sensing the temperature, the structural strength of the protection element 3 is also improved, thereby improving the stability of the protection element 3.

[0085] Furthermore, in some embodiments, the distance Z between the temperature sensing element 32 and the top sealing edge 11 can be made to satisfy: 1mm≤Z≤2mm.

[0086] For example, the distance Z can be 1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, or 2mm.

[0087] This configuration not only further ensures the accuracy of temperature sensing by the temperature sensing element 32 and further improves battery safety, but also further takes into account the structural strength of the protection element 3 and further improves the stability of the protection element 3.

[0088] Continue to refer to Figure 8 As shown, in some embodiments, the temperature sensing element 32 is along the width direction of the battery (specifically, it can be...). Figure 8 The outer contour of the projection in the Y direction is located inside the area enclosed by the outer contour of the projection of the insulating layer 5 along the width direction of the battery.

[0089] In other words, the projected size of the insulating layer 5 along the width of the battery is larger than the projected size of the temperature sensing element 32 along the width of the battery, thereby ensuring the coverage area of ​​the insulating layer 5, further improving the coverage effect of the insulating layer 5 on the temperature sensing element 32, and further ensuring that the temperature sensing element 32 will not come into contact with other components such as the tab and the housing 1, thus avoiding the risk of short circuits, corrosion, etc.

[0090] For example, refer to Figure 8 As shown, for example, the height of the top edge of the insulating layer 5 along the battery height direction (Z direction) is higher than the height of the top edge of the temperature sensing element 32 along the battery height direction, the vertical distance L1 between the top edge of the insulating layer 5 and the top edge of the temperature sensing element 32 is greater than 0, the height of the bottom edge of the insulating layer 5 is lower than the height of the bottom edge of the temperature sensing element 32, and the vertical distance L2 between the bottom edge of the temperature sensing element 32 and the bottom edge of the insulating layer 5 is greater than 0.

[0091] Of course, in other implementations, the outer contour of the projection of the temperature sensing element 32 along the width direction of the battery can overlap with the outer contour of the projection of the insulating layer 5 along the width direction of the battery, that is, the insulating layer 5 can cover the temperature sensing element 32.

[0092] Combination Figures 1 to 5 As shown, in some embodiments, the battery may further include a first thermally conductive layer 7, which is in thermal contact with the temperature sensing element 32 and the tab 21.

[0093] Specifically, the thermally conductive contact here can be that the first thermally conductive layer 7 is in direct contact with the temperature sensing element 32 and the tab 21 respectively, so as to directly conduct the heat of the tab 21 to the temperature sensing element 32, thereby achieving direct heat conduction. Indirect contact is also acceptable, as long as the heat of the tab 21 can be conducted to the temperature sensing element 32 in a timely and effective manner.

[0094] This configuration allows the first thermally conductive layer 7 to conduct heat from the tab 21 to the temperature sensing element 32, thereby further improving the accuracy of the temperature sensing element 32 in sensing the cell temperature and further enhancing the safety of the battery.

[0095] When the protection element 3 is connected to the tab 21 via the adapter 310, the first heat-conducting layer 7 can make thermal contact with at least one of the temperature sensing element 32, the tab 21 and the adapter 310 respectively, so as to conduct the heat of the tab 21 to the temperature sensing element 32, thereby further improving the accuracy of the temperature sensing element 32 in sensing the cell temperature and further improving the safety of the battery.

[0096] For example, the first heat-conducting layer 7 covers the temperature-sensing element 32 and is connected to the tab 21 and / or the adapter 310, thereby realizing timely and effective heat conduction between the tab 21 and the temperature-sensing element 32.

[0097] In a specific implementation, the first thermally conductive layer 7 may contain a thermally conductive acrylic foam tape containing ceramic particles, pressure-sensitive acrylic resin and / or flame retardant, or a thermally conductive silicone grease layer, etc. This embodiment is not limited to these.

[0098] Continue to refer to Figure 8 As shown, in some embodiments, an adhesive layer 4 is provided between the protective element 3 and the top sealing edge 11, and the adhesive layer 4 is bonded to both the protective element 3 and the top sealing edge 11. That is, the protective element 3 is specifically bonded to one side of the top sealing edge 11 through the adhesive layer 4.

[0099] For example, the protective element 3 is specifically connected to the top sealing edge 11 through the element body 31, that is, the element body 31 is bonded to one side of the top sealing edge 11 through the adhesive layer 4.

[0100] The protective element 3 is bonded to one side of the top sealing edge 11 by the adhesive layer 4, which improves the stability of the protective element 3 and the accuracy of the protective element 3 in sensing the temperature of the top sealing edge 11.

[0101] In some embodiments, the adhesive layer 4 may be, for example, a double-sided adhesive. That is, one side of the double-sided adhesive is bonded to the top sealing edge 11, and the other side of the double-sided adhesive is bonded to the protective element 3. The double-sided adhesive is used to bond the protective element 3 to the top sealing edge 11, which is convenient and reliable.

[0102] Specifically, a colloid with good thermal conductivity can be used to bond the protective element 3 to one side of the top seal edge 11. This further ensures that the heat from the top seal edge 11 is transferred to the protective element 3 through the colloid, allowing the temperature sensing element 32 to promptly and accurately sense the temperature of the top seal edge 11, i.e., the temperature of the battery. The material of the protective element 3 can be, for example, ceramic with good thermal conductivity.

[0103] Of course, in other implementations, the adhesive layer 4 can also be a glue coating.

[0104] In addition, in other embodiments, other connection methods can be used to achieve the connection between the protective element 3 and the top sealing edge 11, such as the protective element 3 and the top sealing edge 11 being directly attached and snapped together.

[0105] Reference Figure 1 , Figure 2 and Figure 8 As shown, in some embodiments, the upper edge of the adhesive layer 4 along the height direction (Z direction) of the battery is not higher than the upper edge of the top seal 11.

[0106] This arrangement can, to some extent, prevent the upper edge of the adhesive layer 4 from being higher than the top sealing edge 11, thus avoiding the adhesive layer 4 from sticking to other components and affecting the normal assembly of the battery. In other words, in this embodiment, the adhesive layer 4 is arranged in this way to ensure a reliable connection between the protective element 3 and the top sealing edge 11, while also preventing the adhesive layer 4 from sticking to other components.

[0107] For example, refer to Figure 8 As shown, the upper edge of the adhesive layer 4 can be lower than the upper edge of the top seal 11, that is, the vertical distance c between the top edge of the top seal 11 along the Z direction and the top edge of the adhesive layer 4 along the Z direction is greater than 0. This can further prevent the adhesive layer 4 from bonding with other components and affecting the normal assembly of the battery.

[0108] Of course, in other implementations, the upper edge of the adhesive layer 4 can also be flush with the upper edge of the top sealing edge 11.

[0109] Reference Figure 8 As shown, in some embodiments, the total height H of the adhesive layer 4 in the battery height direction (Z direction) and the total height h of the component body 31 in the battery height direction satisfy: 1 / 3h≤H<h.

[0110] For example, the total length of adhesive layer 4 is H = 1 / 3h, H = 1 / 2h, H = 2 / 3h, H = 3 / 4h, H = 7 / 8h.

[0111] This design ensures the overall length of the adhesive layer 4, thereby guaranteeing the bonding area between the protective element 3 and the top sealing edge 11, and thus ensuring the bonding strength and reliability between the protective element 3 and the top sealing edge 11. Furthermore, it avoids the adhesive layer 4 being too long, which could lead to it being exposed and sticking to other components, thus affecting the normal assembly of the battery, and also saves on the material used for the adhesive layer 4.

[0112] Furthermore, in some embodiments, the total height H of the adhesive layer 4 in the battery height direction (Z direction) can be made to satisfy the following condition: 1 / 2h≤H≤3 / 4h.

[0113] This arrangement further ensures the bonding strength and reliability between the protective element 3 and the top sealing edge 11, while also preventing the adhesive layer 4 from being exposed and affecting the normal assembly of the battery.

[0114] Combination Figure 1 , Figure 8 and Figure 9 As shown, in some embodiments, the battery further includes a second thermally conductive layer 8, which is disposed between the protective element 3 and the top sealing edge 11. For example, the second thermally conductive layer 8 is specifically disposed between the element body 31 and the top sealing edge 11.

[0115] The second thermally conductive layer 8 can make thermal contact with at least one of the top sealing edge 11 and the tab 21, thereby conducting the heat of the top sealing edge 11 and / or the tab 21 to the protection element 3 through the second thermally conductive layer 8, so that the temperature sensing element 32 can sense the temperature of the cell in a timely, effective and accurate manner, further improving the safety of the battery.

[0116] Specifically, the thermally conductive contact here can be direct contact between the second thermally conductive layer 8 and the top sealing edge 11 and / or the tab 21 to achieve direct heat conduction. Alternatively, it can be indirect contact, as long as thermal conduction between the tab 21 and / or the top sealing edge 11 and the second thermally conductive layer 8 is achieved.

[0117] When the protection element 3 is connected to the tab 21 via the adapter 310, the second heat-conducting layer 8 can also make thermal contact with at least one of the tab 21, the adapter 310 and the top sealing edge 11 to conduct the heat of the tab 21 and / or the top sealing edge 11 to the temperature sensing element 32, thereby further improving the accuracy of the temperature sensing element 32 in sensing the cell temperature and further improving the safety of the battery.

[0118] In a specific implementation, the second thermally conductive layer 8 may contain a thermally conductive acrylic foam tape containing ceramic particles, pressure-sensitive acrylic resin and / or flame retardant, or a thermally conductive silicone grease layer, etc. This embodiment is not limited to these.

[0119] Reference Figure 9 As shown, in some embodiments, the second thermally conductive layer 8 and the adhesive layer 4 can be a separate structure, with both the second thermally conductive layer 8 and the adhesive layer 4 located between the protective element 3 and the top sealing edge 11, and the second thermally conductive layer 8 connected between the adhesive layer 4 and the protective element 3.

[0120] For example, the heat from the top sealing edge 11 is transferred to the protective element 3 through the adhesive layer 4 and the second thermally conductive layer 8 in sequence, so that the temperature sensing element 32 can sense the temperature of the battery cell in a timely and effective manner.

[0121] In other embodiments, the second thermally conductive layer 8 can also be an integral structure with the adhesive layer 4, that is, the two are integrally molded, so that the temperature sensing element 32 can sense the temperature of the battery cell in a timely and effective manner, while the protective element 3 and the top sealing edge 11 are bonded together.

[0122] In some embodiments, the housing 1 may specifically be an aluminum-plastic film housing. Figure 8 and Figure 9 As shown, in some embodiments, the top sealing edge 11 may specifically include two oppositely disposed top sealing portions 110.

[0123] Each top seal 110 includes, in sequence, a heat-sealing layer 111, an aluminum layer 112 located outside the heat-sealing layer 111, and a protective layer 113 located outside the aluminum layer 112. The two top seals 110 are connected as one unit by the two heat-sealing layers 111.

[0124] For example, the heat-sealing layer 111 can be made of polypropylene (PP). During encapsulation, the two top sealing parts 110 are placed opposite each other, and the heat-sealing layer 111 is melted by heating. At the same time, pressure is applied to bond the two top sealing parts 110 together through the molten heat-sealing layer 111, thereby achieving the top sealing of the housing 1 and ensuring the sealing of the battery cell 2.

[0125] For example, after the top sealing of the housing 1 is completed, such as when the aluminum layer 112 is exposed at the top of the top sealing edge 11, since the temperature sensing element 32 is located on the side of the component body 31 away from the top sealing edge 11, even if the height of the top sealing edge 11 is low, that is, the height of the top edge of the top sealing edge 11 is too low, the exposed aluminum layer 112 at the top of the top sealing edge 11 will not interfere with the temperature sensing element 32 and cause short circuits, corrosion and other risks. This is conducive to reducing the height of the top sealing edge 11, which in turn is conducive to increasing the internal space of the housing 1 and facilitating the improvement of the energy density of the battery cell 2.

[0126] In some embodiments, in order to further improve the temperature sensing accuracy of the temperature sensing element 32, the circuit is disconnected in time when the temperature is too high or the current is too high. Specifically, the operating temperature of the temperature sensing element 32 can be between 55°C and 85°C.

[0127] The operating temperature here can be understood as the temperature at which the trigger circuit of the temperature sensing element 32 is disconnected. For example, when the temperature sensed by the temperature sensing element 32 reaches the preset temperature, the trigger protection element 3 is activated, the trigger circuit is disconnected, and the battery stops working. This preset temperature is the operating temperature of the temperature sensing element 32.

[0128] Since the temperature sensing element 32 is located away from the top seal edge 11, in order to avoid the delay in triggering the circuit disconnection caused by the temperature sensing element 32 failing to reach the required temperature in time when the battery temperature has reached a high temperature, this embodiment sets the operating temperature of the temperature sensing element 32 within the above-mentioned range. For example, the general operating temperature of the temperature sensing element is 65℃~95℃, but in this embodiment, the operating temperature of the temperature sensing element 32 is set between 55℃~85℃, which relatively reduces the operating temperature of the temperature sensing element 32. This avoids the risk of the battery temperature becoming too high or the overcurrent becoming too large due to the temperature sensing element 32's delayed temperature sensing, which could lead to bulging, combustion, or other risks.

[0129] This embodiment also provides an electrical device, which may be, but is not limited to, mobile devices (mobile phones, laptops, tablets, etc.) or electric vehicles (such as pure electric vehicles, hybrid electric vehicles, electric bicycles, etc.).

[0130] The electrical device in this embodiment includes a battery, which has the same structure and implementation principle as the battery provided in the above embodiments, and can bring the same or similar technical effects. It will not be described in detail here, but can be referred to the description of the above embodiments.

[0131] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, the terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0132] In this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0133] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications or equivalent substitutions made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery, characterized in that, It includes a housing (1), a battery cell (2), and protective components (3); The battery cell (2) is located inside the housing (1). The battery cell (2) has a tab (21). A top sealing edge (11) is formed on one side of the housing (1). The tab (21) extends out from the top sealing edge (11). The protective element (3) is electrically connected to the tab (21), and at least part of the protective element (3) is located on one side of the top sealing edge (11); the protective element (3) includes an element body (31) and a temperature sensing element (32), the temperature sensing element (32) being located on the side of the element body (31) away from the top sealing edge (11).

2. The battery according to claim 1, characterized in that, Along the height direction of the battery, the upper edge of the top seal (11) is not higher than the upper edge of the temperature sensing element (32); And / or, along the width direction of the battery, the distance Z between the temperature sensing element (32) and the top sealing edge (11) satisfies: 0.5mm≤Z≤3mm.

3. The battery according to claim 1, characterized in that, The battery also includes a first thermally conductive layer (7); The first thermally conductive layer (7) is in thermal contact with the temperature sensing element (32) and the electrode (21); Alternatively, the battery may further include an adapter (310) connected between the protective element (3) and the tab (21), wherein the first thermally conductive layer (7) is in thermal contact with at least one of the tab (21) and the adapter (310) and the temperature sensing element (32).

4. The battery according to claim 1, characterized in that, An adhesive layer (4) is provided between the protective element (3) and the top sealing edge (11), and the adhesive layer (4) is bonded to the protective element (3) and the top sealing edge (11) respectively.

5. The battery according to claim 4, characterized in that, Along the height direction of the battery, the upper edge of the adhesive layer (4) is not higher than the upper edge of the top sealing edge (11); And / or, the adhesive layer (4) is a double-sided adhesive; And / or, the total height H of the adhesive layer (4) in the height direction of the battery and the total height h of the component body (31) in the height direction of the battery satisfy: 1 / 3h≤H<h.

6. The battery according to claim 1, characterized in that, The battery also includes a second thermally conductive layer (8), which is disposed between the protective element (3) and the top sealing edge (11); The second thermally conductive layer (8) is in thermal contact with at least one of the top sealing edge (11) and the tab (21); or, the battery further includes a connector (310) connected between the protective element (3) and the tab (21), wherein the second thermally conductive layer (8) is in thermal contact with at least one of the tab (21), the connector (310), and the top sealing edge (11).

7. The battery according to claim 6, characterized in that, An adhesive layer (4) is also provided between the protective element (3) and the top sealing edge (11); The second thermally conductive layer (8) and the adhesive layer (4) are an integral structure, or the second thermally conductive layer (8) is connected between the adhesive layer (4) and the protective element (3).

8. The battery according to any one of claims 1 to 7, characterized in that, The operating temperature range of the temperature sensing element (32) is 55℃~85℃.

9. The battery according to any one of claims 1 to 7, characterized in that, The battery also includes an insulating layer (5); The insulating layer (5) covers at least the side of the temperature sensing element (32) opposite to the top sealing edge (11).

10. The battery according to claim 9, characterized in that, The outer contour of the temperature sensing element (32) projected along the width direction of the battery is located inside the area enclosed by the outer contour of the insulating layer (5) projected along the width direction of the battery. And / or, the insulating layer (5) includes a substrate layer and an adhesive layer disposed on the side of the substrate layer facing the temperature sensing element (32); And / or, the connection between the protective element (3) and the tab (21) is covered with an insulating protective layer (6), and the insulating layer (5) also covers at least part of the insulating protective layer (6); And / or, the battery includes two adapters (310), the two adapters (310) are respectively connected to the two ends of the protection element (3) along the length of the battery, the protection element (3) is connected to the tab (21) through one of the adapters (310), and the connection between the two adapters (310) and the protection element (3) is covered with a protective adhesive layer (33); The insulating layer (5) also covers at least a portion of the protective adhesive layer (33).

11. The battery according to any one of claims 1 to 7, characterized in that, The top sealing edge (11) includes two oppositely arranged top sealing parts (110), each of the top sealing parts (110) includes a heat sealing layer (111), an aluminum layer (112) located outside the heat sealing layer (111), and a protective layer (113) located outside the aluminum layer (112). The two top sealing parts (110) are connected as one unit through the two heat sealing layers (111).

12. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1 to 11.

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