Battery device and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery device and a battery pack, and provides the battery device which comprises a shell, a pole column, a battery core assembly and a puncturing piece, and the puncturing piece is arranged on the outer side of a step part and faces the step part; a first distance h is arranged between the end part, close to the step part, of the puncturing piece and the step part, and the range of the first distance h is 0.2 mm < = h < = 10 mm; and when the internal pressure of the shell reaches preset pressure, the end part, close to the step part, of the puncturing piece is in contact with the step part and punctures the step part to realize pressure relief. According to the embodiment, the deformation quantity of the step part punctured by the puncturing piece can be controlled by regulating and controlling the specific numerical value of the first interval, namely, the pressure of the battery device is controlled. And the first spacing is controlled within a reasonable range, so that normal pressure relief of the battery device during blasting is ensured.

Description

Technical Field

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

[0002] Traditional batteries typically incorporate explosion-proof valves. To improve space utilization, the casing of some batteries has been modified. These explosion-proof valves are formed using two methods: stamping and laser etching.

[0003] However, using these two methods makes it difficult to guarantee the quality of the explosion-proof valve, affecting its pressure relief performance and posing a risk of abnormal explosion. Utility Model Content

[0004] In view of this, the present invention provides a battery device and battery pack to solve the problem of poor pressure relief performance of explosion-proof valves and the risk of abnormal explosion.

[0005] In a first aspect, this utility model provides a battery device, which includes:

[0006] The housing includes a first surface and a second surface disposed opposite to each other; the first surface is composed of stepped portions and connecting portions connected to each other.

[0007] A battery cell assembly is disposed within the housing; the battery cell assembly includes a battery cell and an electrode portion connected to the battery cell, the electrode portion extending from at least one end of the battery cell;

[0008] The stepped portion is recessed into the interior of the housing; the stepped portion and the second surface surround to form a first receiving cavity, and at least a portion of the electrode tab is provided in the first receiving cavity;

[0009] The connecting portion and the second surface surround to form a second receiving cavity, and at least a portion of the battery cell is disposed in the second receiving cavity;

[0010] A piercing element is disposed on the outer side of the stepped portion and facing the stepped portion; a first distance h is provided between the end of the piercing element near the stepped portion and the stepped portion, the first distance h being in the range of 0.2mm≤h≤10mm;

[0011] When the internal pressure of the housing reaches a predetermined level, the end of the puncturing member near the step comes into contact with the step and punctures the step to release the pressure.

[0012] Beneficial Effects: In this embodiment, during the explosion, the stepped portion deforms more than other parts of the casing. Therefore, positioning the piercing element at the stepped portion facilitates immediate pressure relief. Furthermore, the deformation of the stepped portion is directly proportional to the pressure of the battery device. By adjusting the specific value of the first gap, the deformation of the stepped portion when pierced by the piercing element can be controlled, thus controlling the pressure of the battery device. If the first gap is too small, gas will be generated during normal charging and discharging, and the battery casing will bulge slightly. In this case, piercing and pressure relief would directly cause battery failure and affect normal battery use. Moreover, an excessively small first gap could also cause the piercing element to accidentally damage the stepped portion during assembly, directly leading to battery failure. If the first gap is too large, severe thermal runaway within the casing is required, resulting in excessive gas generation and significant deformation of the stepped portion before the piercing element can pierce the casing. This would lead to an excessively violent explosion during pressure relief, posing a significant safety risk. Therefore, controlling the first gap within a reasonable range is essential to ensure normal pressure relief of the battery device during explosion.

[0013] Secondly, this utility model also provides a battery pack, which includes:

[0014] Multiple battery devices as described in any one embodiment are stacked on top of each other;

[0015] In two adjacent battery devices, the terminal post of the first battery device is disposed on the second surface of the first battery device and is located in the space surrounded by the step portion of the second battery device and the second surface of the first battery device. The piercing element of the second battery device is fixed to the terminal post of the first battery device.

[0016] Beneficial effects: By mounting the terminals between the second surface and the stepped portion of the adjacent battery device, this embodiment saves internal space in the housing compared to mounting the terminals on the side of the housing, thus improving the space utilization of the battery pack. It also facilitates the installation of piercing devices on adjacent battery devices, improving the installation efficiency for technicians. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the battery pack in one direction in an embodiment of the present invention;

[0019] Figure 2 In the embodiments of this utility model, the battery pack is in Figure 1 A diagram showing the opposite direction;

[0020] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0021] Figure 4 for Figure 3 A structural schematic diagram from a side view;

[0022] Figure 5 for Figure 4 A magnified view of part B in the diagram;

[0023] Figure 6 For this Figure 3 A structural diagram viewed from the front.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Shell; 11. First surface; 111. Stepped portion; 112. Connecting portion; 12. Second surface;

[0026] 2. Pole post; 3. First receiving cavity; 4. Second receiving cavity; 5. Puncture component; 6. Support assembly; 61. Bracket; 62. Platform frame. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0031] Currently, traditional batteries typically have the terminal post 2 protruding from the surface of the battery casing 1. This structure causes the terminal post 2 to occupy additional space outside the battery casing 1, thus reducing the space utilization rate inside the battery device. To improve space utilization, a recessed area is provided at the end of each individual battery cell. When multiple individual batteries are stacked, the outer side of the recessed area can directly accommodate the terminal post 2 of the corresponding individual battery cell, thus not occupying additional space outside the battery casing 1 and effectively improving the space utilization rate inside the battery device. However, there are two methods for forming the explosion-proof valve on this type of individual battery cell: one is stamping, and the other is laser etching. However, it is difficult to guarantee the quality of the explosion-proof valve when using these two methods, affecting the pressure relief performance and posing a risk of abnormal explosion.

[0032] In view of this, the present invention provides a battery device and battery pack to solve the problem of poor pressure relief performance of explosion-proof valves and the risk of abnormal explosion.

[0033] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0034] According to an embodiment of the present invention, a battery device is provided, which includes: a housing 1, an electrode post 2, a cell assembly, and a puncture component 5.

[0035] Specifically, in this embodiment, the housing 1 includes a first surface 11 and a second surface 12 disposed opposite to each other, and the first surface 11 and the second surface 12 can be the top surface and the bottom surface of the housing 1. When multiple battery devices are stacked, the first surface 11 of one battery and the second surface 12 of another battery are in close contact.

[0036] Furthermore, in this embodiment, the electrode post 2 is disposed on the second surface 12 outside the housing 1 and located at one end of the housing 1. The battery cell assembly is disposed inside the housing 1; the battery cell assembly includes a battery cell and an electrode tab connected to the battery cell, the electrode tab extending out of the housing 1 from at least one end of the battery cell and connected to the electrode post 2.

[0037] Further, in this embodiment, the first surface 11 is composed of a stepped portion 111 and a connecting portion 112 connected to each other. The stepped portion 111 is disposed on the side near the electrode post 2, and the stepped portion 111 is recessed into the interior of the housing 1. The stepped portion 111 and the second surface 12 surround to form a first receiving cavity 3, and at least a portion of the electrode tabs are disposed in the first receiving cavity 3. That is, the first receiving cavity 3 may only contain a portion of the electrode tabs, or it may contain all the electrode tabs. The connecting portion 112 and the second surface 12 surround to form a second receiving cavity 4, and at least a portion of the battery cell is disposed in the second receiving cavity 4. That is, the second receiving cavity 4 may only contain a portion of the battery cell, or it may contain all the battery cells.

[0038] like Figure 1 As shown, a step portion 111 is provided on the left side of the first surface 11, and a terminal post 2 is provided on the left side of the second surface 12. Therefore, when multiple battery devices are stacked, the terminal post 2 of another battery device can be accommodated at the position of the step portion 111 of this battery device.

[0039] Furthermore, in this embodiment, the piercing element 5 is disposed on the outer side of the stepped portion 111 and facing towards the stepped portion 111. A first distance h is provided between the end of the piercing element 5 near the stepped portion 111 and the stepped portion 111, and the first distance h is in the range of 0.2mm ≤ h ≤ 10mm. For example, the first distance h can be 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm. Of course, this embodiment is merely an example of the specific value of the first distance h, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0040] Specifically, when multiple battery devices are stacked, the first surface 11 and the second surface 12 of each battery device abut against other adjacent battery devices. Therefore, under the constraint of other battery devices and the battery pack housing, the deformation of the first surface 11 and the second surface 12 of the battery device is relatively small in the event of an abnormality. Furthermore, since the battery cells are also placed in the second receiving cavity 4, the space in the second receiving cavity 4 for accommodating the gas generated by the battery is relatively small.

[0041] Furthermore, since the sides of the battery are glued and fixed during battery pack assembly, they are not easily deformed. As for the first receiving cavity 3, the tabs only occupy a portion of the space, leaving room for the gas generated during battery charging and discharging. Additionally, a recessed area is provided on the outer side of the step 111, providing a redundancy for expansion and deformation.

[0042] Therefore, when a malfunction in the battery device causes gas to be generated inside the casing 1, the gas is more likely to escape into the first receiving cavity 3, resulting in a larger deformation of the stepped portion 111. Thus, the piercing element 5 can be correspondingly positioned at the stepped portion 111. When a malfunction in the battery device causes gas to be generated inside the casing 1, the stepped portion 111 expands and deforms. Once the internal pressure of the casing 1 reaches a predetermined level, the stepped portion 111 expands to a certain extent, and the piercing element 5, near the end of the stepped portion 111, contacts and pierces the stepped portion 111, thereby releasing pressure.

[0043] During actual operation, when there is pressure inside the housing 1, the step portion 111 expands and deforms; and when the pressure inside the housing 1 reaches a predetermined pressure, the end of the puncturing member 5 near the step portion 111 contacts the step portion 111 and punctures the step portion 111 to relieve pressure.

[0044] With this configuration, in this embodiment, during the explosion, the step portion 111 deforms more than other parts of the casing 1. Therefore, the piercing element 5, positioned correspondingly at the step portion 111, facilitates immediate pressure relief. Furthermore, the deformation of the step portion 111 is directly proportional to the pressure of the battery device. By adjusting the specific value of the first gap, the deformation of the step portion 111 when pierced by the piercing element 5 can be controlled, thus controlling the pressure of the battery device. If the first gap is too small, gas will be generated during normal charging and discharging of the battery, and the battery casing will also experience slight bulging. In this case, piercing and pressure relief would affect the normal use of the battery. Moreover, an excessively small first gap could also cause the piercing element to accidentally damage the step portion 111 during assembly, directly leading to battery failure. If the first gap is too large, the internal thermal runaway of the casing 1 needs to reach a severe level, resulting in excessive gas generation and a large deformation of the step portion 111 before the piercing element can pierce the casing 1. This would result in an excessively violent explosion during pressure relief, posing a significant safety risk. Therefore, controlling the first gap within a reasonable range is essential to ensure that the battery device can release pressure normally during an explosion.

[0045] Furthermore, in an optional embodiment, the end of the puncturing member 5 near the stepped portion 111 has a conical structure.

[0046] With this configuration, when the explosive gas inside the casing 1 reaches the preset pressure, the stepped portion 111 deforms and comes into contact with the puncturing member 5. By setting the end of the puncturing member 5 near the stepped portion 111 as a conical structure, the stepped portion 111 can be easily punctured, thereby depressurizing the casing 1.

[0047] Furthermore, in an optional embodiment, the first spacing h is in the range of 0.4mm ≤ h ≤ 10mm. For example, the first spacing h can be 0.4mm, 0.6mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm. Of course, this embodiment is merely an example of the specific value of the first spacing h, but it is not intended to limit the scope. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0048] Since the conical end is more likely to pierce the casing 1, the range of the first gap can be limited. This avoids excessively violent bursting and further prevents the battery from being punctured during normal expansion. Furthermore, because the conical end is too sharp, properly controlling the specific value of the first gap can prevent technicians from accidentally puncturing the step portion 111 during assembly, thus improving the fault tolerance rate during the assembly process.

[0049] Furthermore, in an optional embodiment, the end of the piercing member 5 near the step portion 111 has a frustum-shaped structure, and the small end of the frustum-shaped structure is disposed near the step portion 111.

[0050] With this design, the frustum end is less sharp than the conical end. The frustum end will only pierce the step 111 if the contact pressure between the step 111 and the frustum end is too great. Therefore, during assembly, the frustum end can effectively avoid piercing the step 111, further improving the fault tolerance rate.

[0051] Furthermore, in an optional embodiment, the first spacing h is in the range of 0.2mm ≤ h ≤ 9.6mm.

[0052] For example, the first spacing h can be 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 9.6mm. Of course, this embodiment is merely an example illustrating the specific value of the first spacing h, and does not impose any limitations on it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0053] This design limits the range of the first gap, preventing excessively violent explosions while also preventing the battery from being punctured during normal expansion. Furthermore, it reduces the distance between adjacent battery units, eliminating unnecessary space and effectively improving space utilization and reducing the overall size of the battery device.

[0054] Furthermore, in an optional embodiment, the end face area of ​​the small end of the frustum-shaped structure is s, and the end face area s ranges from 0.18 mm. 2 ≤s≤20mm 2 between.

[0055] For example, the end face area s can be 0.18 mm. 2 0.2mm 2 0.4mm 2 0.6mm 2 0.8mm 2 1mm 2 2mm 2 4mm 2 6mm 2 8mm 2 10mm 2 12mm 2 14mm 2 16mm 2 18mm 2 20mm 2 Of course, this embodiment is merely an example of the specific value of the end face area s, but it is not intended to limit the scope. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0056] With this design, if the end face area is too small, the piercing element 5 can easily pierce the casing 1, causing the battery to puncture during normal expansion and resulting in an abnormal explosion. Furthermore, the battery is prone to puncture during assembly, leading to battery failure. If the end face area is too large, the piercing element 5 may not be able to pierce the casing 1, resulting in an excessively violent explosion, or even the piercing element failing to pierce the casing 1 at all, causing the explosion-proof structure to fail. This could also prevent the battery from exploding due to excessive thermal runaway gas production, posing a safety risk. Therefore, controlling the end face area within a reasonable range is essential to ensure normal pressure relief of the battery device during an explosion.

[0057] Furthermore, in an optional embodiment, the thickness of the stepped portion 111 is 'a', and the relationship between the thickness 'a' and the first spacing 'h' is 0.02 mm. 2 ≤h×a≤9mm 2 .

[0058] For example, the value of "h×a" can be 0.02mm. 20.04mm 2 0.06mm 2 0.08mm 2 0.1mm 2 0.2mm 2 0.3mm 2 0.4mm, 0.5mm 2 0.6mm 2 0.8mm 2 1mm 2 2mm 2 4mm 2 6mm 2 8mm 2 9mm 2 Of course, this embodiment is merely an example of the specific value of "h×a", but it is not intended to limit the scope. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0059] With this design, if the thickness of the stepped portion 111 is too small, the piercing element 5 can easily pierce the casing 1, making the battery prone to puncture during normal expansion and assembly, while also reducing the overall structural strength of the casing 1. If the thickness of the stepped portion 111 is too large, the piercing element will not easily pierce the casing 1, and once pierced, the explosion will be too violent. This also makes the overall weight of the casing 1 heavier, which is not conducive to the lightweight requirements of the battery device.

[0060] Furthermore, in an optional embodiment, the thickness 'a' ranges from 0.08 mm ≤ a ≤ 1 mm. For example, the thickness 'a' can be 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. Of course, this embodiment is merely an example illustrating the specific value of the thickness 'a', and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0061] This design narrows the thickness range, allowing for the selection of the optimal thickness value. If the thickness of the stepped portion 111 is too small, the piercing element 5 can easily pierce the casing 1, making the battery prone to puncture during normal expansion and assembly, while also reducing the overall structural strength of the casing 1. If the thickness of the stepped portion 111 is too large, the piercing element will not easily pierce the casing 1, and if it does, the explosion will be too violent. This also makes the overall weight of the casing 1 heavier, which is not conducive to the lightweight requirements of the battery device.

[0062] Furthermore, in an alternative embodiment, the battery device further includes a support assembly 6 disposed on the housing 1.

[0063] Specifically, the support assembly 6 includes a bracket 61 and a platform frame 62. A first end of the bracket 61 is connected to the housing 1, and a second end of the bracket 61 extends to the stepped portion 111. The platform frame 62 is connected to the second end of the bracket 61, and the piercing element 5 is mounted on the end face of the platform frame 62 near the stepped portion 111.

[0064] With this configuration, the bracket 61 can be detachably installed onto the housing 1, thereby allowing the puncture component 5 to be detachably installed. This facilitates technicians in flexibly adjusting the installation position and quantity of the puncture component 5, thus effectively achieving the pressure relief function.

[0065] Furthermore, in an optional embodiment, at least two puncture elements 5 are provided along the width direction of the housing 1, and the second distance between two adjacent puncture elements 5 is d1, the second distance d1 being in the range of 0.5mm≤d1≤15mm.

[0066] For example, the second spacing d1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm. Of course, this embodiment is merely an example illustrating the specific value of the first spacing h, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0067] With this configuration, if the second spacing is too small, the pressure exerted on the housing 1 by the multiple piercing elements 5 when piercing the housing 1 will be dispersed, preventing the piercing elements 5 from piercing the housing 1 properly and thus failing to perform their pressure relief function. If the second spacing is too large, the deformation of the housing 1 in the middle section between the two piercing elements 5 cannot be monitored, which may lead to a situation where the deformation of the housing 1 is large in areas where no piercing elements 5 are installed, but no piercing occurs to relieve pressure. Therefore, controlling the second spacing within a reasonable range is essential to ensure that the battery device can properly relieve pressure during an explosion.

[0068] Furthermore, in an optional embodiment, the puncture members 5 are provided in at least two rows along the length direction of the housing 1, and the third distance between two adjacent rows of puncture members 5 is d2 (not shown in the figure), and the range of the third distance d2 is between 0.3mm≤d2≤12mm.

[0069] For example, the third spacing d2 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, or 12mm. Of course, this embodiment is merely an example illustrating the specific value of the first spacing h, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0070] With this configuration, if the third spacing is too small, the pressure exerted on the housing 1 by the multiple piercing elements 5 when piercing the housing 1 will be dispersed, preventing the piercing elements 5 from piercing the housing 1 properly and thus failing to perform their pressure relief function. If the third spacing is too large, the deformation of the housing 1 in the middle section between the two piercing elements 5 cannot be monitored, which may lead to a situation where the deformation of the housing 1 is large in areas where no piercing elements 5 are installed, but no piercing occurs to relieve pressure. Therefore, controlling the third spacing within a reasonable range is essential to ensure that the battery device can properly relieve pressure during an explosion.

[0071] Furthermore, in an optional embodiment, the puncture member 5 is made of metal.

[0072] This design ensures that the piercing component 5 possesses sufficient structural strength to pierce the shell 1. Furthermore, the metal piercing component 5 has a good melting point and corrosion resistance, ensuring its structural integrity after the explosion and depressurization process, preventing it from being affected by the depressurized material. This allows for the recycling and reuse of the piercing component 5.

[0073] Furthermore, in an optional embodiment, the puncture member 5 is made of plastic.

[0074] This design makes the plastic material significantly lighter than other materials, effectively reducing the overall weight of the battery device and facilitating lightweight design. Simultaneously, the plastic puncture component 5 has relatively weak structural strength, making it less likely to puncture the casing 1, thus preventing the puncture component 5 from puncturing the casing 1 during assembly.

[0075] Furthermore, in an optional embodiment, the puncture member 5 is provided in the middle region of the stepped portion 111.

[0076] With this configuration, during an explosion, the middle area of ​​the step portion 111 deforms more than other parts of the shell 1. A piercing element 5 is provided in the middle area of ​​the step portion 111, which can pierce the shell immediately, thereby successfully completing the pressure relief process and improving the explosion-proof effect.

[0077] Furthermore, in an optional embodiment, the piercing element 5 is provided at both ends of the stepped portion 111.

[0078] With this configuration, in the event of an emergency, the middle area may deform abnormally, but the two ends of the step 111 may deform less. Therefore, the puncture parts 5 at the two ends of the step 111 can prevent abnormal punctures.

[0079] Furthermore, in an optional embodiment, the battery device further includes an elastic trigger member disposed on the outer side of the stepped portion 111, wherein the elastic trigger member has the puncture member 5 disposed at one end near the stepped portion 111.

[0080] When the stepped portion 111 reaches a predetermined deformation amount, causing the piercing member 5 to contact the stepped portion 111, the piercing member 5, due to the contact action, drives the elastic trigger member to activate, and causes the piercing member 5 to pierce the stepped portion 111.

[0081] With this configuration, the elastic trigger can provide the piercing force to the piercing element 5 when it is triggered, thereby increasing the piercing strength of the piercing element 5 and ensuring that it can pierce the shell 1. At the same time, it also improves the sensitivity of the piercing element 5, ensuring that piercing and pressure relief can be achieved immediately upon contact, resulting in better explosion-proof performance.

[0082] Furthermore, in an optional embodiment, the stepped portion 111 is provided with a guide groove at the position corresponding to the puncture member 5, the guide groove being adapted to accommodate the puncture member 5.

[0083] With this design, the guide groove prevents the piercing element 5 from penetrating the shell 1 properly during operation, as the shell 1 surface is relatively smooth. Therefore, this embodiment, by providing a guide groove, limits the movement range of the piercing element 5, preventing it from slipping when piercing the shell 1. Simultaneously, the guide groove also provides a directional spray channel for the material ejected during the explosion, preventing the ejected material from interfering with the operation of other battery devices.

[0084] This utility model embodiment also provides a battery pack, which includes:

[0085] Multiple battery devices as described in any of the above embodiments are stacked together.

[0086] In two adjacent battery devices, the terminal post 2 of the first battery device is disposed on the second surface 12 of the first battery device and is located in the space surrounded by the step portion 111 of the second battery device and the second surface 12 of the first battery device. The piercing part 5 of the second battery device is fixed on the terminal post 2 of the first battery device.

[0087] In this embodiment, by installing the terminal post 2 between the second surface 12 and the stepped portion 111 of the adjacent battery device, space inside the housing 1 is saved compared to installing the terminal post 2 on the side of the housing 1, thus improving the space utilization of the battery pack. At the same time, it also facilitates the installation of the piercing piece 5 on adjacent battery devices, improving the installation efficiency for technicians.

[0088] Furthermore, in an optional embodiment, when each battery device is also provided with a support assembly 6, a platform frame 62 is provided on the support assembly 6 of the second battery device. The platform frame 62 of the second battery device is placed on the terminal post 2 of the first battery device, and a piercing element 5 is installed on the end face of the platform frame 62 near the stepped portion 111 of the second battery device. For the specific structural composition, please refer to the above embodiment, which will not be repeated here.

[0089] With this configuration, this embodiment is more convenient to assemble the puncture component 5, and also improves the assembly strength of adjacent battery devices. It can ensure that the puncture component 5 can puncture the battery casing 1 when the battery expands, thus ensuring the pressure relief effect of the puncture component 5.

[0090] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery device, characterized by, The battery device comprises: a shell (1) comprising a first surface (11) and a second surface (12) arranged oppositely; the first surface (11) is composed of a stepped portion (111) and a connecting portion (112) connected to each other; an electric core assembly arranged in the shell (1); the electric core assembly comprises an electric core and a tab portion electrically connected to the electric core, the tab portion extending from at least one end of the electric core; the stepped portion (111) is recessed towards the inside of the shell (1); the stepped portion (111) and the second surface (12) surround a first accommodating cavity (3), and at least part of the tab portion is arranged in the first accommodating cavity (3); the connecting portion (112) and the second surface (12) surround a second accommodating cavity (4), and at least part of the electric core is arranged in the second accommodating cavity (4); a piercing member (5) arranged outside the stepped portion (111) and towards the stepped portion (111); a first spacing h is arranged between the end of the piercing member (5) close to the stepped portion (111) and the stepped portion (111), and the first spacing h ranges from 0.2 mm to 10 mm; when the inside of the shell (1) reaches a predetermined pressure, the end of the piercing member (5) close to the stepped portion (111) is in contact with the stepped portion (111), and the stepped portion (111) is pierced to achieve pressure relief.

2. The battery device according to claim 1, characterized by The end of the piercing member (5) close to the stepped portion (111) is in a conical structure.

3. The battery device of claim 2, wherein The first spacing h ranges from 0.4 mm to 10 mm.

4. The battery device of claim 1, wherein The end of the piercing member (5) close to the stepped portion (111) is a circular truncated cone structure, and the small end of the circular truncated cone structure is arranged close to the stepped portion (111).

5. The battery device of claim 4, wherein, The first spacing h ranges from 0.2 mm to 9.6 mm.

6. The battery device of claim 4, wherein The end surface area of the small end of the frustoconical structure is s, and the range of the end surface area s is 0.18mm 2 ≤ s ≤ 20mm 2 .

7. The battery device according to any one of claims 1 to 6, characterized by The thickness of the stepped portion (111) is 'a', and the relationship between thickness 'a' and the first spacing 'h' is 0.02 mm. 2 ≤h×a≤9mm 2 .

8. The battery device of claim 7, wherein, The thickness a ranges from 0.08 mm to 1 mm.

9. The battery device according to any one of claims 1 to 6, characterized by The battery device further comprises: a support assembly (6) arranged on the shell (1); the support assembly (6) comprises: a support (61), a first end of the support (61) is connected to the shell (1); a second end of the support (61) extends to the stepped portion (111); a platform (62) connected to the second end of the support (61); the platform (62) is provided with the piercing member (5) on the end face close to the stepped portion (111).

10. The battery device according to any one of claims 1 to 6, characterized by Along the width direction of the shell (1), the piercing member (5) is arranged at least twice, and the second spacing d1 between the adjacent two piercing members (5) ranges from 0.5 mm to 15 mm.

11. The battery device according to any one of claims 1 to 6, characterized by Along the length direction of the shell (1), the piercing member (5) is arranged in at least two rows, and the third spacing d2 between the adjacent two rows of piercing members (5) ranges from 0.3 mm to 12 mm.

12. The battery device according to any one of claims 1 to 6, characterized by The material of the piercing member (5) is metal.

13. The battery device according to any one of claims 1 to 6, characterized by The material of the piercing member (5) is plastic.

14. The battery device according to any one of claims 1 to 6, wherein The piercing member (5) is arranged in the middle region of the stepped portion (111).

15. The battery device according to any one of claims 1 to 6, wherein The piercing member (5) is arranged at the two end regions of the step portion (111).

16. The battery device according to any one of claims 1 to 6, wherein The battery device further comprises: An elastic trigger member is arranged outside the step portion (111), and the elastic trigger member is provided with the piercing member (5) at one end close to the step portion (111). When the step portion (111) reaches a predetermined deformation amount so that the piercing member (5) contacts the step portion (111), the piercing member (5) is driven by the contact action to start the elastic trigger member, and the piercing member (5) pierces the step portion (111).

17. The battery device according to any one of claims 1 to 6, wherein The step portion (111) is provided with a guide groove at a position corresponding to the piercing member (5), and the guide groove is adapted to accommodate the piercing member (5).

18. A battery pack, characterized by The battery device comprises: A plurality of battery devices as claimed in any one of claims 1 to 17 are arranged in a stacked manner. In the two adjacent battery devices, the pole (2) of the first battery device is arranged on the second surface (12) of the first battery device and located in a space enclosed by the step portion (111) of the second battery device and the second surface (12) of the first battery device, and the piercing member (5) of the second battery device is fixed on the pole (2) of the first battery device.

19. The battery pack of claim 18, wherein, When a support assembly (6) is further arranged in each battery device, the support assembly (6) of the second battery device is provided with a platform frame (62), the platform frame (62) of the second battery device is placed on the pole (2) of the first battery device, and the piercing member (5) is installed on the end face of the step portion (111) of the second battery device.

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