Battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery and a battery pack. The battery comprises a shell, a conductive part and an insulating sealing layer, the shell is provided with an accommodating cavity and a connecting hole communicated with the accommodating cavity, and a pole core is arranged in the accommodating cavity; the conductive part is electrically connected to the pole core and penetrates through the connecting hole, one end, far away from the pole core, of the conductive part is electrically connected to an external mechanism, and the conductive part is connected to the connecting hole through the insulating sealing layer, so that the conductive part is insulated from the shell; the insulation sealing layer can fail and fall off when reaching the thermal runaway temperature, so that a pressure relief channel is formed. According to the utility model, power is supplied to an external mechanism through the conductive member, insulation between the conductive member and the housing is realized through the insulation sealing layer, and structural requirements are met. When the battery generates thermal runaway, the temperature rises, and the insulation sealing layer reaches the thermal runaway temperature, the insulation sealing layer can lose efficacy and fall off, and a pressure relief channel is formed under the internal pressure, so that the pressure relief of the battery is realized, and the reliability of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and a battery pack. Background Art

[0002] With the rapid development of new energy technologies, batteries have been widely used in fields such as electronic devices, electric vehicles, electric two-wheelers, and power tools, and the requirements for battery quality and safety are also getting higher and higher.

[0003] Currently, a notch groove is provided on the outer shell of the battery, which can rupture when the internal pressure of the battery is too high to form a pressure relief channel and relieve the pressure of the battery. However, the notch groove has poor thermal sensitivity, resulting in poor reliability of pressure relief and a high probability of battery explosion after thermal runaway.

[0004] Based on this, there is an urgent need for a battery and a battery pack to solve the above existing problems. Summary of the Utility Model

[0005] Based on the above, the purpose of the utility model is to provide a battery and a battery pack, which realizes insulation between the conductive member and the housing, and realizes pressure relief of the battery, improving the reliability of the battery.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] On the one hand, a battery is provided, including:

[0008] A housing, the housing is provided with a receiving cavity and a connection hole communicating with the receiving cavity, and an electrode core is arranged in the receiving cavity;

[0009] A conductive member and an insulating and sealing layer, the conductive member is electrically connected to the electrode core and penetrates through the connection hole, one end of the conductive member far from the electrode core is used for electrically connecting to an external mechanism, and the conductive member is connected to the connection hole through the insulating and sealing layer, so that insulation is achieved between the conductive member and the housing;

[0010] When the insulating and sealing layer reaches the thermal runaway temperature, it can fail and fall off to form a pressure relief channel.

[0011] As a preferred technical solution of the battery, the battery further includes a fixing member, the fixing member is connected to the connection hole, the fixing member is provided with a fixing hole, and the conductive member is connected to the fixing hole through the insulating and sealing layer.

[0012] As a preferred technical solution of the battery, neither the fixing member nor the conductive member protrudes from the outer wall of the housing where the connection hole is provided.

[0013] As a preferred technical solution of a battery, the conductive member includes a reinforcing portion and an electrical connection portion. The reinforcing portion and the fixing member are stacked in a first direction, which is the axial direction of the fixing hole. The cross-sections of the reinforcing portion and the electrical connection portion are T-shaped. The electrical connection portion extends into the connection hole, and insulating sealing layers are provided between the reinforcing portion and the electrical connection portion and the fixing member respectively.

[0014] As a preferred technical solution of a battery, the fixing member is provided with a flanging extending towards the electrode core direction, and an insulating sealing layer is provided between the reinforcing portion and the flanging.

[0015] As a preferred technical solution of a battery, the length of the fixing hole is greater than the length of the connection hole.

[0016] As a preferred technical solution of a battery, an insulating sealing layer is provided on the side of the fixing member close to the electrode core; and / or

[0017] An insulating sealing layer is provided on a part of the side wall at one end of the conductive member close to the electrode core.

[0018] As a preferred technical solution of a battery, the conductive member is cylindrical or frustum-shaped or square, and the shape of the fixing hole matches the shape of the conductive member; or

[0019] The side wall of the conductive member is arc-shaped or wavy.

[0020] As a preferred technical solution of a battery, the insulating sealing layer is made of plastic or glass, and the fixing member, the insulating sealing layer and the conductive member are connected by a thermal composite process.

[0021] On the other hand, a battery pack is provided, including a plurality of batteries according to any one of the above solutions.

[0022] The beneficial effects of the present utility model are as follows:

[0023] The present utility model provides a battery and a battery pack. Among them, the electrode core in the battery is electrically connected to an external mechanism through a conductive member to supply power to the external mechanism. The conductive member is connected to the connection hole through an insulating sealing layer to fix the conductive member and improve the stability of the conductive member. Moreover, an insulating sealing layer is provided between the conductive member and the connection hole to insulate the conductive member from the housing and meet the structural requirements. When the battery has a thermal runaway and the temperature rises, the insulating sealing layer can fail and fall off when it reaches the thermal runaway temperature, forming a pressure relief channel under the internal pressure, realizing the pressure relief of the battery and improving the reliability of the battery. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the accompanying drawings required for the description of the embodiments of the present utility model. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained according to the content of the embodiments of the present utility model and these accompanying drawings.

[0025] Figure 1 is a structural sectional view of the battery provided by the specific embodiment of the present utility model;

[0026] Figure 2 is one of the partial structural sectional views of the battery provided by the specific embodiment of the present utility model;

[0027] Figure 3 is the second of the partial structural sectional views of the battery provided by the specific embodiment of the present utility model;

[0028] Figure 4 is the third of the partial structural sectional views of the battery provided by the specific embodiment of the present utility model;

[0029] Figure 5 is the fourth of the partial structural sectional views of the battery provided by the specific embodiment of the present utility model;

[0030] Figure 6 is the fifth of the partial structural sectional views of the battery provided by the specific embodiment of the present utility model;

[0031] Figure 7 is the sixth of the partial structural sectional views of the battery provided by the specific embodiment of the present utility model.

[0032] The markings in the figure are as follows:

[0033] 1. Housing; 11. Connection hole; 12. Flange edge;

[0034] 2. Conductive member; 21. Reinforcing portion; 22. Electrical connection portion;

[0035] 3. Electrode core;

[0036] 4. Insulating and sealing layer;

[0037] 5. Fixing member; 51. Fixing hole; 52. Flanging. Specific embodiment

[0038] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the accompanying drawings.

[0039] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0041] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left", and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] Embodiment 1

[0043] As Figure 1 and Figure 2 shown, this embodiment provides a battery pack, which includes a plurality of batteries. Each battery includes a housing 1, a conductive member 2, and an insulating and sealing layer 4. Specifically, the housing 1 is provided with a receiving cavity and a connection hole 11 communicating with the receiving cavity. A pole core 3 is arranged in the receiving cavity; the conductive member 2 is electrically connected to the pole core 3 and passes through the connection hole 11. One end of the conductive member 2 away from the pole core 3 is used for electrical connection to an external mechanism. The conductive member 2 is connected to the connection hole 11 through the insulating and sealing layer 4 so as to insulate the conductive member 2 from the housing 1; when the insulating and sealing layer 4 reaches the thermal runaway temperature, it can fail and fall off to form a pressure relief channel. In this embodiment, the thermal runaway temperature is greater than 100 °C.

[0044] Among them, the electrode core 3 inside the battery is electrically connected to an external mechanism through the conductive member 2 to supply power to the external mechanism. The conductive member 2 is connected to the connection hole 11 through the insulating and sealing layer 4 to fix the conductive member 2 and improve the stability of the conductive member 2. Moreover, an insulating and sealing layer 4 is provided between the conductive member 2 and the connection hole 11 to insulate the conductive member 2 from the housing 1, meeting the structural requirements. When the battery undergoes thermal runaway and the temperature rises, the insulating and sealing layer 4 can fail and fall off when it reaches the thermal runaway temperature, forming a pressure relief channel under the internal pressure, realizing the pressure relief of the battery and improving the reliability of the battery.

[0045] Since the size of the housing 1 is large, while the sizes of the conductive member 2 and the insulating and sealing layer 4 are small, it is not convenient to directly connect the conductive member 2, the insulating and sealing layer 4 and the housing 1 by a thermal composite process. Preferably, the battery further includes a fixing member 5. The fixing member 5 is connected to the connection hole 11, and the fixing member 5 is provided with a fixing hole 51. The conductive member 2 is connected to the fixing hole 51 through the insulating and sealing layer 4. Among them, the conductive member 2, the insulating and sealing layer 4 and the fixing member 5 can form a module and be produced separately. Subsequently, the module formed by the conductive member 2, the insulating and sealing layer 4 and the fixing member 5 is directly connected to the connection hole 11, improving the assembly convenience. Furthermore, the conductive member 2 is indirectly connected to the connection hole 11 through the insulating and sealing layer 4 and the fixing member 5. Since the connection hole 11 is connected to the fixing member 5 and the size of the fixing member 5 is larger than that of the conductive member 2, the size of the connection hole 11 can be increased, facilitating the operation of connecting the fixing member 5 to the connection hole 11. In this embodiment, the fixing member 5 can be connected to the connection hole 11 by means of laser welding, ultrasonic welding, resistance welding, riveting or gluing.

[0046] In this embodiment, the material of the insulating and sealing layer 4 is plastic or glass, and the fixing member 5, the insulating and sealing layer 4 and the conductive member 2 are connected by a thermal composite process. When the material of the insulating and sealing layer 4 is plastic, the plastic can be materials such as PP (Polypropylene), PE (Polyethylene), PET (Polyethylene Terephthalate) or PVC (Polyvinyl Chloride). When the material of the insulating and sealing layer 4 is plastic, when the insulating and sealing layer 4 reaches the thermal runaway temperature, the insulating and sealing layer 4 is in a molten state, and the internal air pressure of the housing 1 causes the insulating and sealing layer 4 to fail and fall off, forming a pressure relief channel under the internal pressure, realizing the pressure relief of the battery and improving the reliability of the battery. When the material of the insulating and sealing layer 4 is glass, when the insulating and sealing layer 4 reaches the thermal runaway temperature, the adhesion between the insulating and sealing layer 4 and the fixing member 5 and the conductive member 2 decreases, and the internal pressure drives the insulating and sealing layer 4 to fail and fall off, realizing the pressure relief of the battery and improving the reliability of the battery.

[0047] When the conductive member 2 is directly connected to the connection hole 11, since the wall thickness of the housing 1 is relatively thin and the length of the connection hole 11 is relatively small, the effective contact area between the insulating and sealing layer 4 and the connection hole 11 is small, and the connection strength is weak. Preferably, the length of the fixing hole 51 is greater than the length of the connection hole 11. The conductive member 2 is connected to the fixing hole 51 through the insulating and sealing layer 4. Since the length of the fixing hole 51 is long, the effective contact area with the insulating and sealing layer 4 is increased, the contact area between the insulating and sealing layer 4 and the fixing hole 51 is increased, the connection strength is improved, and the sealing formation between the conductive member 2 and the fixing hole 51 is also improved. In this embodiment, the length range of the fixing hole 51 is 0.4 mm - 5 mm.

[0048] Preferably, the conductive member 2 includes a reinforcing portion 21 and an electrical connection portion 22. The reinforcing portion 21 and the fixing member 5 are stacked along the first direction, and the first direction is the axial direction of the fixing hole 51. The cross-sections of the reinforcing portion 21 and the electrical connection portion 22 are T-shaped. The electrical connection portion 22 extends into the connection hole 11, and an insulating and sealing layer 4 is provided between both the reinforcing portion 21 and the electrical connection portion 22 and the fixing member 5. The T-shaped conductive member 2 is connected to the fixing member 5 through the insulating and sealing layer 4, which increases the effective contact area with the insulating and sealing layer 4, thereby increasing the connection strength between the conductive member 2 and the fixing member 5 and improving the sealing performance between the conductive member 2 and the fixing member 5.

[0049] Further preferably, as Figure 3 shown, the fixing member 5 is provided with a flange 52 extending towards the electrode core 3, and an insulating and sealing layer 4 is provided between the reinforcing portion 21 and the flange 52. Among them, the effective contact area between the fixing member 5 and the insulating and sealing layer 4 is increased, and the cross-section of the insulating and sealing layer 4 is Z-shaped. The insulating and sealing layer 4 is bent multiple times, further improving the sealing performance between the conductive member 2 and the fixing member 5. In this embodiment, the fixing member 5 and the conductive member 2 are square or circular. The fixing member 5 can be provided with a flange 52 at one end, or the fixing member 5 can be symmetrically provided with flanges 52 at both ends.

[0050] In the prior art, the electrode core of the battery is a rivet. The rivet has many processes and low processing efficiency during the battery manufacturing process. Moreover, a flange is provided on the outer wall of the battery housing. When the rivet is used as the pole column, the protruding amount relative to the outer wall of the housing is large. To avoid burning the pole column during welding, the height of the flange needs to be higher than that of the pole column, resulting in a wider flange. When the length of the battery is fixed, setting a wider flange results in a smaller effective space inside the battery (i.e., the size of the winding core inside the battery), reducing the energy density. As Figure 1As shown in the figure, in this embodiment, neither the fixing member 5 nor the conductive member 2 protrudes from the outer wall of the housing 1. On the one hand, the conductive member 2 replaces the rivet as the structure of the pole column, reducing the manufacturing difficulty and improving the processing efficiency; on the other hand, neither the fixing member 5 nor the conductive member 2 protrudes from the outer wall of the housing 1 where the connection hole 11 is provided, and the width of the flange 12 on one side of the housing 1 where the connection hole 11 is provided can be the same as the width of other sides. When the length of the battery is fixed, the protrusion amount of the flange 12 is reduced, thereby increasing the effective space of the battery and improving the energy density of the battery. Of course, in other embodiments, the fixing member 5 and the conductive member 2 may also protrude from the outer wall of the housing 1 where the connection hole 11 is provided.

[0051] Embodiment 2

[0052] This embodiment provides a battery, and the structure of the battery provided in this embodiment is basically the same as that of Embodiment 1, except that there are some differences in the structure of the conductive member 2. The same structures as those in Embodiment 1 will not be described in detail in this embodiment.

[0053] In this embodiment, as Figures 4 - 6 shown, the conductive member 2 is cylindrical or frustum-shaped or square, the fixing hole 51 matches the shape of the conductive member 2, and the insulating sealing layer 4 is filled between the fixing hole 51 and the conductive member 2. In other embodiments, the side wall of the conductive member 2 is arc-shaped or wavy.

[0054] Preferably, an insulating sealing layer 4 is provided on the side of the fixing member 5 close to the electrode core 3; and / or an insulating sealing layer 4 is provided on a part of the side wall at one end of the conductive member 2 close to the electrode core 3. In this embodiment, as Figure 7 shown, an insulating sealing layer 4 is provided on the side of the fixing member 5 close to the electrode core 3, and an insulating sealing layer 4 is provided on a part of the side wall at one end of the conductive member 2 close to the electrode core 3. Among them, the bottom of the insulating sealing layer 4 overlaps the electrode core 3, and the insulating sealing layer 4 can insulate between the fixing member 5 and the electrode core 3, and at the same time can support the fixing member 5 and the conductive member 2, improving the stability of the conductive member 2 and the fixing member 5. The area where the insulating sealing layer 4 is not provided at one end of the conductive member 2 close to the electrode core 3 serves as an avoidance area for the electrode core 3 to pass through and be electrically connected to the conductive member 2, and the insulating sealing layer 4 can support the conductive member 2.

[0055] Note that the above is only the preferred embodiment of the present utility model and the applied technical principles. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in more detail through the above embodiments, the present utility model is not limited to the above embodiments only. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.

Claims

1. A battery, characterized in that: include: A shell (1), the shell (1) being provided with a receiving cavity and a connecting hole (11) communicating with the receiving cavity, and a pole core (3) being provided in the receiving cavity; A conductive member (2) and an insulating sealing layer (4), wherein the conductive member (2) is electrically connected to the pole core (3) and is disposed through the connecting hole (11), and an end of the conductive member (2) away from the pole core (3) is used for electrically connecting to an external mechanism, and the conductive member (2) is connected to the connecting hole (11) through the insulating sealing layer (4) so ​​as to insulate the conductive member (2) from the housing (1); The insulating sealing layer (4) can fail and fall off when reaching the thermal runaway temperature, thereby forming a pressure relief channel.

2. The battery according to claim 1, characterized in that The battery further comprises a fixing member (5), the fixing member (5) being connected to the connection hole (11), the fixing member (5) being provided with a fixing hole (51), and the conductive member (2) being connected to the fixing hole (51) via the insulating sealing layer (4).

3. The battery according to claim 2, characterized in that The fixing member (5) and the conductive member (2) are not protruding from the outer wall of the housing (1) on which the connecting hole (11) is provided.

4. The battery according to claim 2, characterized in that The conductive member (2) comprises a reinforcing portion (21) and an electrical connection portion (22); the reinforcing portion (21) and the fixing member (5) are superimposed along a first direction, the first direction being the axial direction of the fixing hole (51); the cross-sections of the reinforcing portion (21) and the electrical connection portion (22) are T-shaped; the electrical connection portion (22) extends into the connection hole (11); and an insulating sealing layer (4) is provided between the reinforcing portion (21) and the electrical connection portion (22) and the fixing member (5).

5. The battery according to claim 4, characterized in that The fixing member (5) is provided with a flange (52) extending in the direction of the pole core (3), and an insulating sealing layer (4) is provided between the reinforcement portion (21) and the flange (52).

6. The battery according to claim 2, characterized in that The length of the fixing hole (51) is greater than the length of the connecting hole (11).

7. The battery according to claim 2, characterized in that The insulating sealing layer (4) is provided on a side of the fixing member (5) close to the pole core (3); and / or The insulating sealing layer (4) is provided on the side wall of one end portion of the conductive member (2) close to the pole core (3).

8. The battery according to claim 2, characterized in that The conductive member (2) is cylindrical, truncated cone or square, and the fixing hole (51) matches the shape of the conductive member (2); or The side wall of the conductive element (2) is arc-shaped or wavy.

9. The battery according to any one of claims 2 to 8, characterized in that: The insulating sealing layer (4) is made of plastic or glass, and the fixing member (5), the insulating sealing layer (4) and the conductive member (2) are connected by a thermal composite process.

10. A battery pack, characterized in that: The invention comprises a plurality of batteries according to any one of claims 1 to 9.

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