A battery and a battery pack

Abstract

The utility model relates to battery technical field discloses a battery and battery package, a kind of battery, including shell, cover plate, electric core and baffle;Shell has accommodating cavity and open mouth;Cover plate is capped in open mouth, and cover plate is equipped with liquid injection hole;Electric core is located in accommodating cavity;Baffle is connected to the one end of electric core in first direction close to cover plate;Along first direction, the orthographic projection of liquid injection hole on auxiliary plane falls into the orthographic projection range of baffle on auxiliary plane;Wherein, along first direction, the size of baffle is hmm, and the spacing distance between electric core and cover plate is H1mm satisfy: 0.5<=h / H1<=0.8;The battery of the utility model sets up baffle on electric core, and baffle can guide electrolyte from liquid injection hole into accommodating cavity, to avoid forming liquid seal phenomenon, improve electrolyte overall infiltration efficiency;By limiting 0.5<=h / H1<=0.8, can realize the uniform infiltration of electric core from bottom to top, improve the coverage degree of electrolyte to pole piece and diaphragm.

Description

Technical Field

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

[0002] In lithium-ion battery production, the uniform wetting of the electrolyte directly affects battery performance and safety. In existing technologies, after the electrolyte is injected into the cell through the injection hole, it is often due to the limitations of the cell's internal structure or an unreasonable flow path that the electrolyte tends to form a "liquid seal" phenomenon when flowing around the cell. This means that the electrolyte accumulates in local areas, hindering its penetration into the central area. The liquid seal phenomenon can easily lead to uneven electrolyte distribution, resulting in poor electrode wetting and reducing the overall electrolyte wetting efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a battery and a battery pack including the battery, wherein the battery can avoid the formation of a "liquid seal" phenomenon and improve the overall electrolyte wetting efficiency.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a battery having a first direction, a second direction, and a third direction perpendicular to each other, including a shell, a cover plate, a battery cell, and a baffle; the shell has a receiving cavity, and the shell has an opening at one end in the first direction that communicates with the receiving cavity; the cover plate seals the opening, and the cover plate has an injection hole that communicates with the receiving cavity; the battery cell is disposed in the receiving cavity; the baffle is connected to the end of the battery cell near the cover plate in the first direction; the second direction and the third direction intersect to form an auxiliary plane, and along the first direction, the orthographic projection of the injection hole on the auxiliary plane falls within the orthographic projection range of the baffle on the auxiliary plane; wherein, along the first direction, the size of the baffle is h mm, and the distance between the battery cell and the cover plate is H1 mm satisfying: 0.5 ≤ h / H1 ≤ 0.8.

[0005] Compared with the prior art, the battery provided in this embodiment of the present invention has the following advantages:

[0006] (1) By setting baffles on the cell and limiting the orthogonal projection of the injection hole on the auxiliary plane to fall within the orthogonal projection range of the baffles, the baffles can guide the electrolyte entering the cavity from the injection hole, so that the electrolyte flows downward along the surface of the baffles and preferentially diffuses along the outside of the Mylar film of the cell to the bottom of the cavity, thereby avoiding the accumulation of electrolyte in the top or middle area of ​​the cell, thus avoiding the formation of liquid seal, reducing the possibility of local accumulation of electrolyte in the middle area of ​​the cell, and improving the overall wetting efficiency of electrolyte.

[0007] (2) When h / H1 > 0.8, the baffle is too close to the cover plate. During the welding process between the cover plate and the shell, the high temperature generated by welding is easily conducted to the baffle, causing a decrease in the material properties or structural deformation of the baffle, affecting the flow guiding function. By limiting h / H1 ≤ 0.8 to control the upper limit of the h / H1 ratio, the baffle can be prevented from being damaged due to its proximity to the welding area. When 0.5 > h / H1, the baffle is too far from the injection hole, and the electrolyte can easily bypass the outside of the baffle and flow directly into the cell, resulting in a weakening of the baffle's flow guiding effect and an inability to effectively guide the electrolyte flow. The electrolyte is uniformly wetted from bottom to top, and by limiting the ratio of h / H1 to 0.5, the baffle is positioned on the critical path of the initial electrolyte flow, thus improving the conductivity. Therefore, by limiting h / H1 to 0.8, this invention controls the ratio within a reasonable range. The baffle effectively guides the electrolyte away from the high-resistance area in the middle of the cell and prevents the electrolyte from accumulating around the perimeter and forming a liquid seal, thereby achieving uniform wetting from bottom to top and improving the coverage of the electrolyte on the electrodes and separator. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a battery provided in Embodiment 1 of this utility model;

[0009] Figure 2 This is a first cross-sectional view of a battery provided in Embodiment 1 of this utility model;

[0010] Figure 3 yes Figure 2 Enlarged view of point A;

[0011] Figure 4 This is a first dimensional schematic diagram of the cover plate, battery cell, and baffle provided in Embodiment 1 of this utility model;

[0012] Figure 5 This is a second-dimensional schematic diagram of the battery cell and baffle provided in Embodiment 1 of this utility model;

[0013] Figure 6 This is a second cross-sectional view of a battery provided in Embodiment 1 of this utility model;

[0014] Figure 7 yes Figure 6 Enlarged view of point B;

[0015] Figure 8 This is a schematic diagram of the injection hole and baffle provided in Embodiment 1 of this utility model forming an orthographic projection on an auxiliary plane;

[0016] Figure 9 This is a partial structural diagram of a battery provided in Embodiment 2 of this utility model;

[0017] Figure 10 This is a partial structural schematic diagram of a battery provided in Embodiment 3 of this utility model;

[0018] Figure 11 This is a partial structural schematic diagram of a battery provided in Embodiment 4 of this utility model.

[0019] In the figure, 1 is the shell; 11 is the receiving cavity; 12 is the opening; 111 is the first inner wall surface; 112 is the second inner wall surface; 1111 is the first flow channel; and 1121 is the second flow channel.

[0020] 2. Cover plate; 21. Injection hole; 210. First central axis;

[0021] 3. Battery cell; 31. First side; 32. Second side;

[0022] 4. Baffle plate; 41. First plate; 42. Second plate; 43. Third plate; 44. Guide channel; 401. First end; 402. Second end; 411. Bottom wall of the channel; 421. First side wall; 431. Second side wall; 440. Second central axis;

[0023] 100. Auxiliary plane;

[0024] Z, first direction; Y, second direction; X, third direction. Detailed Implementation

[0025] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0026] In the description of this utility model, it should be understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, parts, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts, components, and / or groups thereof. It should be understood that when we say a part is "connected" to another part, it can be directly connected to the other part, or there may be intermediate parts. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0027] Example 1

[0028] like Figures 1 to 8 As shown, this utility model provides a battery having a first direction Z, a second direction Y and a third direction X that are perpendicular to each other, including a shell 1, a cover plate 2, a cell 3 and a baffle 4.

[0029] The housing 1 has a receiving cavity 11, and one end of the housing 1 in the first direction Z has an opening 12 communicating with the receiving cavity 11; a cover plate 2 covers the opening 12, and the cover plate 2 has an injection hole 21 communicating with the receiving cavity 11; a battery cell 3 is disposed in the receiving cavity 11; a baffle 4 is connected to the end of the battery cell 3 in the first direction Z near the cover plate 2; the second direction Y and the third direction X intersect to form an auxiliary plane 100. Since the first direction Z, the second direction Y, and the third direction X are perpendicular to each other, the first direction Z and the auxiliary plane 100 are perpendicular. Along the first direction Z, the orthographic projection of the injection hole 21 on the auxiliary plane 100 falls within the orthographic projection range of the baffle 4 on the auxiliary plane 100;

[0030] Wherein, along the first direction Z, the size of the baffle 4 is h mm, and the distance between the battery cell 3 and the cover plate 2 is H1 mm, which satisfies: 0.5≤h / H1≤0.8.

[0031] Based on this technical solution, by setting a baffle 4 on the cell 3 and limiting the orthogonal projection of the injection hole 21 on the auxiliary plane 100 to fall within the orthogonal projection range of the baffle 4, the baffle 4 can guide the electrolyte entering the receiving cavity 11 from the injection hole 21, so that the electrolyte flows downward along the surface of the baffle 4 and preferentially diffuses along the outside of the Mylar film of the cell 3 to the bottom of the receiving cavity 11, thereby avoiding the accumulation of electrolyte in the top or middle area of ​​the cell 3, thus avoiding the formation of liquid seal phenomenon, reducing the possibility of local accumulation of electrolyte in the middle area of ​​the cell 3, and improving the overall wetting efficiency of electrolyte.

[0032] When h / H1 > 0.8, the baffle 4 is too close to the cover plate 2. During the welding process between the cover plate 2 and the shell 1, the high temperature generated by welding is easily conducted to the baffle 4, causing a decrease in the material properties or structural deformation of the baffle 4, affecting its flow guiding function. By limiting h / H1 to ≤ 0.8 to control the upper limit of the h / H1 ratio, damage to the baffle 4 due to its proximity to the welding area can be avoided. When 0.5 > h / H1, the baffle is too far from the injection hole, and the electrolyte can easily bypass the outside of the baffle 4 and flow directly into the cell 3, resulting in a weakened flow guiding effect of the baffle 4 and an inability to effectively guide the electrolyte to the bottom of the cell 3. The electrolyte is uniformly wetted from bottom to top. By limiting the h / H1 ratio to 0.5 ≤ h / H1, the lower limit of the h / H1 ratio can be controlled to ensure that the baffle is on the critical path of the initial flow of the electrolyte, thereby improving the conduction efficiency. Therefore, by limiting the h / H1 ratio to 0.5 ≤ h / H1 ≤ 0.8, this invention controls the h / H1 ratio within a reasonable range. The baffle can effectively guide the electrolyte to avoid the high resistance area in the middle of the cell and prevent the electrolyte from accumulating around the perimeter to form a liquid seal. This achieves uniform wetting from bottom to top, improves the coverage of the electrolyte on the electrode and separator, and improves the consistency of the battery's internal resistance and electrochemical performance.

[0033] Preferably, the height is 0.3mm ≤ hmm ≤ 0.5mm. Within this height range, the baffle 4 can fully intervene in the initial flow path of the electrolyte after it is injected from the injection hole 21, guiding the electrolyte to flow along the outside of the Mylar membrane of the cell 3 to the receiving cavity 11, avoiding the electrolyte from directly impacting the central area of ​​the cell 3 or accumulating at the top, thereby improving the bottom-up wetting effect of the electrolyte and reducing the occurrence of liquid sealing. Since the height of the baffle 4 is controlled within 0.5mm, in the case of limited space at the top of the cell 3, the baffle 4 can be prevented from being too close to the cover plate 2, thereby reducing the risk of material performance degradation or structural deformation of the baffle 4 due to high temperature conduction during the welding process between the cover plate 2 and the shell 1.

[0034] Preferably, the baffle is made of the aforementioned polymer material with excellent comprehensive performance, which satisfies the electrolyte conduction function while taking into account multiple requirements such as corrosion resistance, insulation, processability and cost control; for example, the material of the baffle 4 can be including but not limited to polyethylene terephthalate (PET), polypropylene (PP), polyvinyl chloride (PVC), polycarbonate (PC), etc.

[0035] hmm can be any dimension value that satisfies 0.3mm≤hmm≤0.5mm, such as 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.40mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.50mm, etc.

[0036] In this first embodiment, the height direction of the battery cell 3 extends along the first direction Z, that is, the first direction Z is the height direction of the battery cell 3; the thickness direction of the battery cell 3 extends along the second direction Y, that is, the second direction Y is the thickness direction of the battery cell 3; and the width direction of the battery cell 3 extends along the third direction X, that is, the third direction X is the width direction of the battery cell 3.

[0037] It should be noted that the casing is used to encapsulate components such as the battery cell and electrolyte. The casing can come in various shapes and sizes, such as cuboids or hexagonal prisms, and its shape can be determined based on the specific shape and size of the battery cell. The casing can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, and aluminum alloys.

[0038] It should be noted that the cover plate 2 refers to the component that covers the opening 12 of the housing 1 to isolate the internal space of the housing 1 from the external environment. The shape of the cover plate 2 can be adapted to the shape of the housing to achieve isolation. The cover plate can be made of a material with a certain hardness and strength (such as aluminum alloy).

[0039] It should be noted that cell 3 includes multiple electrodes and a separator located between adjacent electrodes. The electrodes include two types with opposite polarities: positive and negative electrodes. The separator is located between the positive and negative electrodes. Cell 3 operates by the movement of metal ions between the positive and negative electrodes. The cycling process of cell 3 is the process of metal ions moving from the positive electrode to the negative electrode and then from the negative electrode to the positive electrode. The separator, as an insulating layer, prevents short circuits within the battery cell caused by contact between the positive and negative electrodes. Furthermore, as a semi-permeable layer, the separator prevents larger molecules from passing through while allowing smaller charged ions to pass through.

[0040] It should be noted that the insulating film is usually Mylar film, which covers the outer periphery of the battery cell to prevent the battery cell from contacting the metal casing and causing a short circuit.

[0041] This invention does not limit the specific structural form of the battery cell; it is applicable to both wound battery cells formed by winding process and stacked battery cells formed by stacking process.

[0042] See Figures 2 to 5 ,and Figure 8 The baffle 4 includes a first piece 41, a second piece 42, and a third piece 43. The first piece 41 is connected to the battery cell 3. The second piece 42 is connected to one end of the first piece 41 in the third direction X. The third piece 43 is connected to the end of the first piece 41 in the third direction X away from the second piece 42 and is disposed opposite to the second piece 42. The second piece 42, the first piece 41, and the third piece 43 define a guide groove 44. One side wall of the first piece 41 located in the guide groove 44 is the bottom wall 411 of the groove. Along the first direction Z, the orthographic projection of the injection hole 21 on the auxiliary plane 100 falls within the orthographic projection range of the bottom wall 411 on the auxiliary plane 100, that is, the guide groove 44 covers the projection of the injection hole 21.

[0043] The design of the flow guide trough 44 allows the electrolyte falling from the injection hole 21 to be effectively collected and guided to a predetermined path, preventing direct splashing or disordered flow of the electrolyte and improving its utilization and wetting efficiency. Compared with the traditional planar baffle 4, the trough structure has stronger directional control capability, improving the controllable flow guidance effect of the electrolyte. By limiting the projection of the injection hole 21 onto the auxiliary plane 100 to fall within the projection range of the bottom wall 411 of the flow guide trough 44, it is ensured that the electrolyte landing point is completely within the coverage area of ​​the flow guide trough 44, so that the electrolyte can be effectively guided to the bottom of the cell 3 in the initial stage, thereby avoiding the high resistance area in the middle, breaking the liquid seal phenomenon, and improving the overall wetting uniformity.

[0044] The first sheet 41 serves as a basic fixing part connected to the battery cell 3. The second sheet 42 and the third sheet 43 are respectively located at its two ends, forming a stable U-shaped or U-shaped structure. While ensuring the current conduction function, this structure enhances the overall structural strength of the baffle 4, preventing deformation or displacement due to electrolyte impact or vibration, and improving the long-term stability of the battery pack. This composite baffle 4 structure can be integrally formed by stamping, bending, or injection molding. The manufacturing process is mature and the cost is controllable. Furthermore, the length and height of each sheet can be flexibly adjusted according to different sized battery cells 3, making it highly adaptable and conducive to achieving product standardization and automated production.

[0045] The second piece 42 has a first sidewall 421 located within the flow channel 44, and the third piece 43 has a second sidewall 431 located within the flow channel 44.

[0046] Specifically, the bottom wall 411 of the channel is composed only of the first piece 41, that is, the bottom area of ​​the channel 44 is entirely borne by the first piece 41. The second piece 42 and the third piece 43 mainly serve as side wall structures, which together with the first piece 41 define the spatial shape of the channel 44.

[0047] In this first embodiment, the bottom wall 411 of the tank is flat, meaning it is a straight line in the second direction and has a planar structure perpendicular to the first direction Z. The flat bottom wall facilitates the formation of a stable flow layer of electrolyte within the guide tank, avoiding flow disturbances and localized accumulation caused by uneven bottom surfaces or slope changes, thereby improving the controllability and wetting efficiency of the electrolyte injection process.

[0048] In this first embodiment, the first sidewall 421 is the first straight-edge sidewall, and the second sidewall 431 is the second straight-edge sidewall. The straight-edge sidewall has better structural rigidity and molding consistency, which helps to improve the overall mechanical properties of the baffle 4. It is not easy to deform or displace due to external forces during battery pack transportation, assembly and use, thus ensuring the long-term stability of the flow guiding function.

[0049] As can be understood, a straight-edge sidewall refers to a sidewall that is perpendicular to the bottom surface, forming an angle of 90°; this setup typically means that the width of the sidewall remains constant from bottom to top. Simply put, if you imagine a simple rectangular or square cross-section groove, its two sides would rise directly in straight lines, forming right angles with the bottom; this is what is called a "straight-edge sidewall".

[0050] Preferably, along the first direction Z, the depth of the guide groove 44 is D mm, satisfying: 1 mm ≤ D mm ≤ 4 mm. Within this depth range, the guide groove 44 can effectively accommodate the electrolyte falling from the injection hole 21, preventing electrolyte splashing or overflowing into the baffle 4 area, thereby ensuring that the electrolyte flows to the bottom of the cell 3 along a predetermined path. Compared to shallow grooves (e.g., groove depth less than 1 mm), this depth provides sufficient space to guide the electrolyte flow; compared to deep grooves (e.g., groove depth greater than 4 mm), it does not affect assembly accuracy or increase structural complexity due to excessively large grooves.

[0051] In this first embodiment, the injection hole 21 has a first central axis 210, and the guide groove 44 has a second central axis 440; the first central axis 210 and the second central axis 440 are collinear, that is, the center of the injection hole 21 and the center of the guide groove 44 are aligned.

[0052] When the injection hole 21 is aligned with the center of the guide channel 44, the electrolyte can accurately fall into the bottom area of ​​the guide channel 44 after falling from the injection hole 21. This avoids problems such as electrolyte splashing, uneven distribution, or local accumulation caused by eccentric injection, thereby improving electrolyte utilization and the controllability of the injection process. At the same time, the center alignment allows the electrolyte to be symmetrically distributed along the bottom wall 411 of the guide channel 44 and flow evenly to both sides after entering the channel, forming a stable flow direction. This helps guide the electrolyte to flow quickly to the bottom of the battery cell 3 and wet the battery cell 3 from bottom to top, improving the overall wetting efficiency and reducing the occurrence of liquid sealing.

[0053] Along the third direction X, the size of the baffle 4 is W1mm, and the size of the battery cell 3 is W2mm. Preferably, the above parameters satisfy: 0.1≤W1 / W2≤0.6.

[0054] When the W1 / W2 ratio is less than 0.1, the coverage area of ​​the baffle 4 along the length of the cell 3 is small, which cannot effectively guide the electrolyte flow along the width of the cell 3, resulting in insufficient electrolyte wetting in some areas. By controlling W1 / W2 above a reasonable lower limit, the baffle 4 can be ensured to have sufficient lateral coverage, thereby improving the uniformity of electrolyte distribution along the entire length of the cell 3. When the W1 / W2 ratio is greater than 0.6, the lateral dimension of the baffle 4 is too large, which can easily interfere with the surrounding structural components of the cell 3 (such as tabs, connecting pieces, or reinforcing ribs of the housing 1) during assembly, affecting assembly efficiency and even causing component damage. By controlling the upper limit of this ratio within a reasonable range, structural conflicts between the baffle 4 and other components can be effectively avoided, ensuring the overall assembly accuracy and structural stability of the battery pack.

[0055] Along the first direction Z, the distance between the bottom wall 411 of the groove and the cover plate 2 is H2mm. Preferably, the above parameters satisfy: 1mm≤H2mm.

[0056] If the distance H2 between the bottom wall 411 of the tank and the cover plate 2 is too small, it will compress the flow space of the electrolyte from the injection hole 21 into the guide tank 44, causing increased local resistance, affecting the injection rate and flowability of the electrolyte, and even causing air resistance. By controlling H2mm to 1mm or more, the above problems can be effectively avoided, ensuring that the electrolyte flows smoothly into the guide tank 44 and flows downward along the predetermined path, improving injection efficiency and consistency.

[0057] See Figures 6 to 7 The battery cell 3 has a first side surface 31 and a second side surface 32 that are oppositely arranged in the second direction Y; the baffle 4 has a first end 401 and a second end 402 that are oppositely arranged in the second direction Y; the housing 1 has a first inner wall surface 111 and a second inner wall surface 112 located in the receiving cavity 11, and the first inner wall surface 111 and the second inner wall surface 112 are oppositely arranged; along the second direction Y, the first inner wall surface 111 is located on the side of the first side surface 31 away from the second side surface 32, the first end 401 is located between the first inner wall surface 111 and the first side surface 31, the second inner wall surface 112 is located on the side of the second side surface 32 away from the first side surface 31, and the second end 402 is located between the second inner wall surface 112 and the second side surface 32; a first flow channel 1111 is formed between the first inner wall surface 111 and the first side surface 31, and a second flow channel 1121 is formed between the second inner wall surface 112 and the second side surface 32.

[0058] By placing the first end 401 between the first inner wall surface 111 and the first side surface 31, the first end 401 can extend to the first flow channel 1111. The second end 402 is placed between the second inner wall surface 112 and the second side surface 32, allowing the second end 402 to extend to the second flow channel 1121. This allows the electrolyte, after being injected through the injection hole 21, to fall onto the surface of the baffle 4 and flow through the first end 401 to the first flow channel 1111 and through the second end 402 to the second flow channel 1121, respectively. This simultaneously guides the electrolyte in both regions of the battery cell 3, avoiding uneven wetting caused by the electrolyte flowing only on one side. Through the arrangement of the first flow channel 1111 and the second flow channel 1121, the electrolyte can be guided more quickly from the top of the battery cell 3 to the bottom, shortening the wetting path, reducing the time the electrolyte accumulates at the top, and improving the overall wetting efficiency.

[0059] Along the second direction Y, the distance between the first end 401 and the first side surface 31 is L1mm, and the distance between the second end 402 and the second side surface 32 is L2mm. Preferably, the above parameters satisfy: 0 < L1mm ≤ 1mm; 0 < L2mm ≤ 1mm.

[0060] When L1mm > 1mm, the first end 401 of the baffle 4 will be too close to the first inner wall surface 111 of the shell 1, resulting in an excessively small gap between them, which hinders the electrolyte from flowing from the first end 401 of the baffle 4 into the first flow channel 1111. Similarly, when L2mm > 1mm, the gap between the second end 402 of the baffle 4 and the second inner wall surface 112 will be too narrow, affecting the electrolyte from entering the second flow channel 1121. By controlling the upper limits of L1mm and L2mm, such structural interference problems can be effectively avoided, ensuring the smooth flow of the electrolyte.

[0061] More preferably, L1 = L2. By limiting L1 = L2, the first end 401 and the second end 402 can be made symmetrical about the center of the cell 3, so that the baffle 4 is in a symmetrical position about the center of the cell 3. This helps to guide the electrolyte to flow symmetrically downward along both sides of the cell 3 and collect in the bottom area, thereby more effectively avoiding the high resistance area in the center of the cell 3, breaking the liquid seal effect, and improving the overall wetting efficiency.

[0062] Example 2

[0063] See Figure 9 The battery provided in Embodiment 2 differs from the battery provided in Embodiment 1 only in that the center of the injection hole 21 and the center of the guide groove 44 are offset, and the offset between the center of the injection hole 21 and the center of the guide groove 44 is less than or equal to 0.25 times the width of the guide groove 44.

[0064] Specifically, along the third direction X, the distance between the second piece 42 and the third piece 43 is K1mm, the injection hole 21 has a first central axis 210, the guide groove 44 has a second central axis 440, and the distance between the first central axis 210 and the second central axis 440 is K2mm. Preferably, the above parameters satisfy: 0<K2 / K1≤0.25.

[0065] The offset between the centers of the injection hole 21 and the guide channel 44 should be less than or equal to 0.25 times the width of the guide channel 44. In actual production, achieving perfect alignment between the injection hole 21 and the guide channel 44 is challenging due to mold tolerances, assembly errors, or equipment positioning deviations. By allowing an offset ratio of K2 / K1 ≤ 0.25, the overall assembly tolerance of the battery pack can be effectively improved without affecting the electrolyte's flow performance, thus enhancing manufacturing consistency and production line efficiency. Controlling the offset to no more than one-quarter of the width K1 of the guide channel 44 ensures that the electrolyte still falls within the effective coverage area of ​​the guide channel 44, preventing excessive offset from causing direct splashing or flowing into dead zones, thereby maintaining a good flow path and wetting efficiency.

[0066] Example 3

[0067] See Figure 10The battery provided in Embodiment 3 differs from the battery provided in Embodiment 1 only in that the bottom wall 411 of the tank has a shape that is high in the middle and low on both sides in the second direction Y.

[0068] The bottom wall 411 of the tank has a structure that is high in the middle and low on both sides, which allows the electrolyte to fall into the guide tank 44 from the injection hole 21 and then flow automatically to both sides of the cell 3 under its own gravity and the guidance of the inclined surface of the bottom of the tank. This avoids the electrolyte from accumulating in the central area to form a "liquid seal", thereby significantly improving the wetting efficiency of the electrolyte to the areas on both sides of the cell 3.

[0069] Based on this, the bottom wall 411 of the tank has a shape that is high in the middle and low on both sides in the second direction Y (i.e., the thickness direction of the cell 3). Specifically, the first piece 41 is designed or processed into a structure with an inclined surface or an arc-shaped transition surface during the manufacturing process. Its height in the second direction Y gradually decreases from the central area to both sides, thus forming a bottom profile with a central bulge and lower sides. This structure can be achieved by stamping, bending, etc. For example, in some embodiments, the middle of the first piece 41 bulges upward to form a cross-section similar to a "V" or an "inverted trapezoid", so that after the electrolyte falls into the guide tank 44, it naturally flows to both sides under the action of gravity; in another embodiment, the middle of the first piece 41 is a relatively high plane, which gradually transitions to a downward sloping surface to both sides, forming a structure similar to a "ridge", guiding the electrolyte to flow evenly to both sides of the cell 3.

[0070] In this third embodiment, the first piece 41 forms a cross-section similar to a "V".

[0071] In one specific embodiment, the inclination angle of the bottom wall 411 of the tank is 2° to 10°, that is, from the middle to both sides. The inclination slope of the bottom wall 411 of the tank is controlled within this range, which can ensure the smooth flow of electrolyte and prevent the structural strength and assembly stability of the baffle 4 from being affected by the excessive slope.

[0072] In another embodiment, the bottom wall 411 of the tank has a rounded transition shape, that is, it descends smoothly from the middle to both sides in an arc shape. This structure is more conducive to the continuous flow of electrolyte and the discharge of air, and is suitable for high energy density battery products that require high uniformity of electrolyte wetting.

[0073] Example 4

[0074] See Figure 11 The battery provided in Embodiment 4 differs from the battery provided in Embodiment 1 only in that the first sidewall 421 is an outwardly inclined first sidewall and the second sidewall 431 is an outwardly inclined second sidewall.

[0075] The inclined sidewalls effectively guide the electrolyte to diffuse along a set direction, reducing the stagnation area and backflow of electrolyte within the guide channel 44. Compared to straight sidewalls, the outward-inclined design increases the initial flow area of ​​the electrolyte, allowing it to be more evenly distributed and flow quickly to the bottom of the cell 3, thereby improving overall wetting efficiency. Simultaneously, the outward-inclined sidewall structure can accommodate injection paths with a certain angle of deviation, providing greater tolerance for injection needle positions and offering stronger adaptability.

[0076] Understandably, an inclined sidewall refers to a sidewall that is not perpendicular to the bottom surface, but rather inclined outwards or inwards at a certain angle. This means that as the depth of the groove increases (or decreases), the width of the groove will also increase or decrease accordingly. If the sidewall is inclined outwards, the opening will be larger as it goes up; if it is inclined inwards, the opening will be smaller as it goes up.

[0077] Example 5

[0078] This utility model also provides a battery pack, which includes the battery according to any one of the above claims.

[0079] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery, characterized in that, It has a first direction, a second direction, and a third direction that are perpendicular to each other, including: A housing having a receiving cavity, wherein the housing has an opening at one end in the first direction that communicates with the receiving cavity; A cover plate that seals the opening, the cover plate having an injection hole communicating with the receiving cavity; The battery cell is disposed within the receiving cavity; A baffle is connected to one end of the battery cell near the cover plate in the first direction; the second direction and the third direction intersect to form an auxiliary plane, and along the first direction, the orthographic projection of the injection hole on the auxiliary plane falls within the orthographic projection range of the baffle on the auxiliary plane; Wherein, along the first direction, the size of the baffle is h mm, and the distance between the battery cell and the cover plate is H1 mm, satisfying: 0.5≤h / H1≤0.

8.

2. The battery according to claim 1, characterized in that, 0.3mm≤hmm≤0.5mm.

3. The battery according to claim 1, characterized in that, The thickness direction of the battery cell extends along the second direction; The battery cell has a first side and a second side disposed opposite to each other in the second direction; The baffle has a first end and a second end that are disposed opposite to each other in the second direction; The housing has a first inner wall surface and a second inner wall surface located within the receiving cavity and disposed opposite to each other in the second direction; Along the second direction, the first inner wall surface is located on the side of the first side facing away from the second side, the first end is located between the first inner wall surface and the first side, the second inner wall surface is located on the side of the second side facing away from the first side, and the second end is located between the second inner wall surface and the second side. A first flow channel is formed between the first inner wall surface and the first side surface, and a second flow channel is formed between the second inner wall surface and the second side surface.

4. The battery according to claim 3, characterized in that, Along the second direction, the distance between the first end and the first side is L1mm, and the distance between the second end and the second side is L2mm; satisfying: 0<L1mm≤1mm; 0<L2mm≤1mm.

5. The battery according to claim 4, characterized in that, L1 = L2.

6. The battery according to claim 1, characterized in that, The length direction of the battery cell extends along the third direction; Along the third direction, the size of the baffle is W1mm and the size of the battery cell is W2mm, satisfying: 0.1≤W1 / W2≤0.

6.

7. The battery according to any one of claims 1-6, characterized in that, The baffle includes a first piece, a second piece, and a third piece. The first piece is connected to the battery cell. The second piece is connected to one end of the first piece in the third direction. The third piece is connected to one end of the first piece in the third direction away from the second piece and is disposed opposite to the second piece. The second piece, the first piece, and the third piece define a flow guide groove. The side wall of the first piece located in the flow guide groove is the bottom wall of the groove. Wherein, along the first direction, the orthographic projection of the injection hole on the auxiliary plane falls within the orthographic projection range of the bottom wall of the tank on the auxiliary plane.

8. The battery according to claim 7, characterized in that, Along the first direction, the depth of the guide channel is Dmm, which satisfies: 1mm≤Dmm≤4mm.

9. The battery according to claim 7, characterized in that, The injection hole has a first central axis, and the guide groove has a second central axis; the first central axis and the second central axis are collinear.

10. The battery according to claim 7, characterized in that, Along the third direction, the distance between the second piece and the third piece is K1mm; the injection hole has a first central axis, the guide groove has a second central axis, and the distance between the first central axis and the second central axis is K2mm, satisfying: 0<K2 / K1≤0.

25.

11. The battery according to claim 7, characterized in that, Along the first direction, the distance between the bottom wall of the groove and the cover plate is H2mm, which satisfies: 1mm≤H2mm.

12. The battery according to claim 7, characterized in that, The bottom wall of the trough is high in the middle and low on both sides in the second direction.

13. The battery according to claim 7, characterized in that, The second piece has a first sidewall located within the flow channel, the first sidewall being a first straight sidewall, and the third piece has a second sidewall within the flow channel, the second sidewall being a second straight sidewall.

14. The battery according to claim 7, characterized in that, The second piece has a first sidewall located within the flow channel, the first sidewall being an outwardly inclined first sidewall, and the third piece has a second sidewall within the flow channel, the second sidewall being an outwardly inclined second sidewall.

15. A battery pack, characterized in that, Includes the battery according to any one of claims 1-14.

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